Add `.github` configuration.

Use two-step homebrew install in README.
Update to version 3.6.4
2023-06-27 16:59:08 -07:00 · 2020-10-06 23:13:23 -07:00 · 2020-09-11 18:22:23 -07:00 · 2020-09-11 17:46:18 -07:00 · 2020-09-11 17:40:47 -07:00 · 2020-09-11 17:22:02 -07:00
31 changed files with 4683 additions and 881 deletions
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@ -0,0 +1,2 @@
+github: xwmx
+custom: https://paypal.me/WilliamMelody
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@ -0,0 +1,84 @@
+###############################################################################
+# .github/workflows/tests.yml
+#
+# NOTE: GitHub Actions does not allocate a TTY, preventing detection of
+# piped input using `[[ -t 0 ]]`.
+#
+# More information:
+#
+# https://github.com/actions/runner/issues/241
+#
+# faketty is a GitHub action that uses work-arounds to provide a tty:
+#
+# https://github.com/marketplace/actions/faketty
+#
+# Scripts used by faketty for each platform:
+#
+# linux: `faketty`
+#
+# ```bash
+# #!/bin/bash
+#
+# script -q -e -c "$*"
+# ```
+#
+# win32: `faketty.ps1`
+#
+# ```posh
+# Invoke-Expression "$args"
+# ```
+#
+# darwin: `faketty`
+#
+# requires: `brew install expect`
+#
+# ```bash
+# #!/bin/bash
+#
+# unbuffer $*
+# ```
+###############################################################################
+
+name: "hosts · Test Suite"
+
+on:
+  pull_request:
+    branches: [ master ]
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  test-macos-11:
+    name: "Test: macOS Big Sur 11.0"
+    runs-on: macos-11.0
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Setup"
+        run: |
+          brew update
+          brew install bats-core
+          brew install expect
+      - name: "Set $TERM=xterm"
+        run:  printf "TERM=xterm\\n" >> $GITHUB_ENV
+      - name: "Run bats tests"
+        run:  unbuffer bats test
+  test-ubuntu-latest:
+    name: "Test: Ubuntu Latest"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Setup"
+        run: |
+          sudo apt-get update
+          sudo apt-get install bats -y
+      - name: "Install bats-core"
+        run: |
+          git clone https://github.com/bats-core/bats-core.git "${HOME}/bats-core" &&
+            cd "${HOME}/bats-core"
+          git checkout 2e2e5df6adf0b846b411b6b2f7bb654cbc3e2c4e
+          sudo ./install.sh /usr/local
+      - name: "Set $TERM=xterm"
+        run:  printf "TERM=xterm\\n" >> $GITHUB_ENV
+      - name: "Run bats tests"
+        run:  script -q -e -c "bats test"
--- a/.shellcheckrc
+++ b/.shellcheckrc
@ -0,0 +1,22 @@
+###############################################################################
+# .shellcheckrc
+#
+# https://github.com/koalaman/shellcheck
+# https://github.com/koalaman/shellcheck/wiki/Ignore
+###############################################################################
+
+# Disable SC2183
+#
+# Running into this: https://github.com/koalaman/shellcheck/issues/1310
+# TODO: Check if resolved.
+#
+#https://github.com/koalaman/shellcheck/wiki/SC2183
+disable=SC2183
+
+# Disable SC2206 and SC2207
+#
+# `IFS` and `noglob` are set.
+#
+# https://github.com/koalaman/shellcheck/wiki/SC2206
+# https://github.com/koalaman/shellcheck/wiki/SC2207
+disable=SC2206,SC2207
--- a/2
+++ b/2
@ -3,6 +3,8 @@ PREFIX ?= /usr/local

 install:
 	install $(BIN) $(PREFIX)/bin
+	./$(BIN) completions install

 uninstall:
 	rm -f $(PREFIX)/bin/$(BIN)
+	./$(BIN) completions uninstall
--- a/README.md
+++ b/README.md
@ -0,0 +1,694 @@
+[![Build Status](https://img.shields.io/github/actions/workflow/status/xwmx/hosts/tests.yml?branch=master)](https://github.com/xwmx/hosts/actions)
+
+        __               __
+       / /_  ____  _____/ /______
+      / __ \/ __ \/ ___/ __/ ___/
+     / / / / /_/ (__  ) /_(__  )
+    /_/ /_/\____/____/\__/____/
+
+# Hosts
+
+`hosts` is a command line program for managing
+[hosts file](https://en.wikipedia.org/wiki/Hosts_\(file\)) entries.
+
+`hosts` works with existing hosts files and entries, making it easier to add,
+remove, comment, and search hosts file entries using simple, memorable
+commands.
+
+`hosts` is designed to be lightweight, easy to use, and contained in a
+single, portable script that can be `curl`ed into any environment.
+
+## Installation
+
+### Homebrew
+
+To install with [Homebrew](http://brew.sh/):
+
+```bash
+brew tap xwmx/taps
+brew install hosts
+```
+
+### npm
+
+To install with [npm](https://www.npmjs.com/package/hosts.sh):
+
+```bash
+npm install --global hosts.sh
+```
+
+### bpkg
+
+To install with [bpkg](https://github.com/bpkg/bpkg):
+
+```bash
+bpkg install xwmx/hosts
+```
+
+### Make
+
+To install with [Make](https://en.wikipedia.org/wiki/Make_(software)),
+clone this repository, navigate to the clone's root directory, and run:
+
+```bash
+sudo make install
+```
+
+### Manual
+
+To install as an administrator, copy and paste one of the following multi-line
+commands:
+
+```bash
+# install using wget
+sudo wget https://raw.github.com/xwmx/hosts/master/hosts -O /usr/local/bin/hosts &&
+  sudo chmod +x /usr/local/bin/hosts &&
+  sudo hosts completions install
+
+# install using curl
+sudo curl -L https://raw.github.com/xwmx/hosts/master/hosts -o /usr/local/bin/hosts &&
+  sudo chmod +x /usr/local/bin/hosts &&
+  sudo hosts completions install
+```
+
+###### User-only Installation
+
+To install with just user permissions, simply add the `hosts` script to your
+`$PATH`. If you already have a `~/bin` directory, for example, you can use
+one of the following commands:
+
+```bash
+# download with wget
+wget https://raw.github.com/xwmx/hosts/master/hosts -O ~/bin/hosts && chmod +x ~/bin/hosts
+
+# download with curl
+curl -L https://raw.github.com/xwmx/hosts/master/hosts -o ~/bin/hosts && chmod +x ~/bin/hosts
+```
+
+Installing with just user permissions doesn't install the completions, but
+`hosts` works without them. If you have `sudo` access and want to install the
+completion scripts, run the following command:
+
+```bash
+sudo hosts completions install
+```
+
+### Arch Linux
+
+A package for Arch users is also
+[available in the AUR](https://aur.archlinux.org/packages/hosts/).
+
+### Tab Completion
+
+Bash and Zsh tab completion is enabled when `hosts` is installed using
+Homebrew, npm, bpkg, or Make. If you are installing `hosts` manually,
+[completion can be enabled with a few commands](etc/README.md).
+
+## Usage
+
+### Listing Entries
+
+`hosts` with no arguments lists the entries in the system's hosts file:
+
+```bash
+> hosts
+127.0.0.1       localhost
+255.255.255.255 broadcasthost
+::1             localhost
+fe80::1%lo0     localhost
+```
+
+`hosts` called with a string or regular expression will search for entries
+that match.
+
+```bash
+> hosts localhost
+127.0.0.1   localhost
+::1         localhost
+fe80::1%lo0 localhost
+
+> hosts '\d\d\d'
+127.0.0.1         localhost
+255.255.255.255   broadcasthost
+```
+
+### Adding Entries
+
+To add an entry, use `hosts add`:
+
+```bash
+> hosts add 127.0.0.1 example.com
+Added:
+127.0.0.1 example.com
+```
+
+Run `hosts` or `hosts list` to see the new entry in the list:
+
+```bash
+> hosts
+127.0.0.1         localhost
+255.255.255.255   broadcasthost
+::1               localhost
+fe80::1%lo0       localhost
+127.0.0.1         example.com
+```
+
+### Removing Entries
+
+To remove an entry, use `hosts remove`, which can take an IP
+address, domain, or regular expression:
+
+```bash
+> hosts remove example.com
+Removing the following entries:
+127.0.0.1	example.com
+Are you sure you want to proceed? [y/N] y
+Removed:
+127.0.0.1	example.com
+```
+
+### Blocking and Unblocking Domains
+
+`hosts` provides easy commands for blocking and unblocking domains with IPv4
+and IPv6 entries:
+
+```bash
+> hosts block example.com
+Added:
+127.0.0.1   example.com
+Added:
+fe80::1%lo0 example.com
+Added:
+::1         example.com
+
+> hosts unblock example.com
+Removed:
+127.0.0.1   example.com
+Removed:
+fe80::1%lo0 example.com
+Removed:
+::1         example.com
+```
+
+### Enabling / Disabling Entries
+
+All entries are enabled by default. Disabiling an entry comments it out
+so it has no effect, but remains in the hosts file ready to be enabled
+again.
+
+```bash
+> hosts
+127.0.0.1         localhost
+255.255.255.255   broadcasthost
+::1               localhost
+fe80::1%lo0       localhost
+127.0.0.1         example.com
+
+> hosts disable example.com
+Disabling:
+127.0.0.1	example.com
+
+> hosts
+127.0.0.1         localhost
+255.255.255.255   broadcasthost
+::1               localhost
+fe80::1%lo0       localhost
+
+Disabled:
+---------
+127.0.0.1         example.com
+
+> hosts enable example.com
+Enabling:
+127.0.0.1	example.com
+
+> hosts
+127.0.0.1         localhost
+255.255.255.255   broadcasthost
+::1               localhost
+fe80::1%lo0       localhost
+127.0.0.1         example.com
+```
+
+### Backups
+
+Create backups of your hosts file with `hosts backups create`:
+
+```bash
+> hosts backups create
+Backed up to /etc/hosts--backup-20200101000000
+```
+
+List your backups with `hosts backups`. If you have existing hosts file
+backups, `hosts` will include them:
+
+```bash
+> hosts backups
+hosts--backup-20200101000000
+hosts.bak
+```
+
+`hosts backups compare` will open your hosts file with `diff`:
+
+```bash
+> hosts backups compare hosts--backup-20200101000000
+--- /etc/hosts	2020-01-01 00:00:00.000000000
+++ /etc/hosts--backup-20200101000000	2020-01-01 00:00:00.000000000
+@@ -8,3 +8,4 @@
+ 255.255.255.255  broadcasthost
+ ::1              localhost
+ fe80::1%lo0      localhost
+127.0.0.1        example.com
+```
+
+View a backup with `hosts backups show`:
+
+```bash
+> hosts backups show hosts--backup-20200101000000
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1       localhost
+255.255.255.255 broadcasthost
+::1             localhost
+fe80::1%lo0     localhost
+127.0.0.1       example.com
+```
+
+Restore a backup with `hosts backups restore`. Before a backup is
+restored, a new one is created to avoid data loss:
+
+```bash
+> hosts backups restore hosts--backup-20200101000000
+Backed up to /etc/hosts--backup-20200102000001
+Restored from backup: hosts--backup-20200101000000
+```
+
+### Viewing and Editing `/etc/hosts` Directly
+
+`hosts file` prints the raw contents of `/etc/hosts`:
+
+```bash
+> hosts file
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1       localhost
+255.255.255.255 broadcasthost
+::1             localhost
+fe80::1%lo0     localhost
+```
+
+`hosts edit` opens `/etc/hosts` in your editor:
+
+```bash
+> hosts edit
+```
+
+### `--auto-sudo`
+
+When the `--auto-sudo` flag is used, all write operations that require
+`sudo` will automatically rerun the command using `sudo` when the current user
+does not have write permissions for the hosts file.
+
+To have this option always enabled, add the following line to your shell
+configuration (`.bashrc`, `.zshrc`, or similar):
+
+```bash
+alias hosts="hosts --auto-sudo"
+```
+
+## Help
+
+```text
+Usage:
+  hosts [<search string>]
+  hosts add <ip> <hostname> [<comment>]
+  hosts backups [create | (compare | delete | restore | show) <filename>]
+  hosts block <hostname>...
+  hosts completions (check | install [-d | --download] | uninstall)
+  hosts disable (<ip> | <hostname> | <search string>)
+  hosts disabled
+  hosts edit
+  hosts enable (<ip> | <hostname> | <search string>)
+  hosts enabled
+  hosts file
+  hosts list [enabled | disabled | <search string>]
+  hosts search <search string>
+  hosts show (<ip> | <hostname> | <search string>)
+  hosts subcommands [--raw]
+  hosts remove (<ip> | <hostname> | <search string>) [--force]
+  hosts unblock <hostname>...
+  hosts --auto-sudo
+  hosts -h | --help
+  hosts --version
+
+Options:
+  --auto-sudo  Run write commands with `sudo` automatically.
+  -h --help    Display this help information.
+  --version    Display version information.
+
+Help:
+  hosts help [<command>]
+```
+
+For full usage, run:
+
+```text
+hosts help
+```
+
+For help with a particular command, try:
+
+```text
+hosts help <command name>
+```
+
+## Subcommands
+
+<p align="center">
+  <a href="#hosts-1">(default)</a> •
+  <a href="#hosts-add">add</a> •
+  <a href="#hosts-backups">backups</a> •
+  <a href="#hosts-block">block</a> •
+  <a href="#hosts-completions">completions</a> •
+  <a href="#hosts-disable">disable</a> •
+  <a href="#hosts-disabled">disabled</a> •
+  <a href="#hosts-edit">edit</a> •
+  <a href="#hosts-enable">enable</a> •
+  <a href="#hosts-enabled">enabled</a> •
+  <a href="#hosts-file">file</a> •
+  <a href="#hosts-help">help</a> •
+  <a href="#hosts-list">list</a> •
+  <a href="#hosts-remove">remove</a> •
+  <a href="#hosts-search">search</a> •
+  <a href="#hosts-show">show</a> •
+  <a href="#hosts-subcommands">subcommands</a> •
+  <a href="#hosts-unblock">unblock</a> •
+  <a href="#hosts-version">version</a>
+</p>
+
+### `hosts`
+
+```text
+Usage:
+  hosts [<search string>]
+
+Description:
+  List the existing IP / hostname pairs, optionally limited to a specified
+  state. When provided with a seach string, all matching enabled entries will
+  be printed.
+
+  Alias for `hosts list`
+```
+
+### `hosts add`
+
+```text
+Usage:
+  hosts add <ip> <hostname> [<comment>]
+
+Description:
+  Add a given IP address and hostname pair, along with an optional comment.
+
+Exit status:
+  0   Entry successfully added.
+  1   Invalid parameters or entry exists.
+```
+
+### `hosts backups`
+
+```text
+Usage:
+  hosts backups
+  hosts backups create
+  hosts backups compare <filename>
+  hosts backups delete  <filename>
+  hosts backups restore <filename> [--skip-backup]
+  hosts backups show    <filename>
+
+Subcommands:
+  backups           List available backups.
+  backups create    Create a new backup of the hosts file.
+  backups compare   Compare a backup file with the current hosts file.
+  backups delete    Delete the specified backup.
+  backups restore   Replace the contents of the hosts file with a
+                    specified backup. The hosts file is automatically
+                    backed up before being overwritten unless the
+                    '--skip-backup' flag is specified.
+  backups show      Show the contents of the specified backup file.
+
+Description:
+  Manage backups.
+
+Exit status:
+  0   Success.
+  1   Invalid parameters or backup not found.
+```
+
+### `hosts block`
+
+```text
+Usage:
+  hosts block <hostname>...
+
+Description:
+  Block one or more hostnames by adding new entries assigned to `127.0.0.1`
+  for IPv4 and both `fe80::1%lo0` and `::1` for IPv6.
+
+Exit status:
+  0   <hostname> successfully blocked.
+  1   Invalid parameters or entry exists.
+```
+
+#### Blocklists
+
+- [jmdugan/blocklists](https://github.com/jmdugan/blocklists)
+- [notracking/hosts-blocklists](https://github.com/notracking/hosts-blocklists)
+
+### `hosts completions`
+
+```text
+Usage:
+  hosts completions (check | install [-d | --download] | uninstall)
+
+Options:
+  -d, --download  Download the completion scripts and install.
+
+Description:
+  Manage completion scripts. For more information, visit:
+  https://github.com/xwmx/hosts/blob/master/etc/README.md
+
+Exit status:
+  0   Completions successfully installed.
+  1   Invalid parameters or other error.
+```
+
+### `hosts disable`
+
+```text
+Usage:
+  hosts disable (<ip> | <hostname> | <search string>)
+
+Description:
+  Disable one or more entries based on a given ip address, hostname, or
+  search string.
+
+Exit status:
+  0   Entry successfully disabled.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts disabled`
+
+```text
+Usage:
+  hosts disabled
+
+Description:
+  List all disabled entries. This is an alias for `hosts list disabled`.
+
+Exit status:
+  0   One or more disabled entries found.
+  1   Invalid parameters or no disabled entries found.
+```
+
+### `hosts edit`
+
+```text
+Usage:
+  hosts edit
+
+Description:
+  Open the /etc/hosts file in your $EDITOR.
+```
+
+### `hosts enable`
+
+```text
+Usage:
+  hosts enable (<ip> | <hostname> | <search string>)
+
+Description:
+  Enable one or more disabled entries based on a given ip address, hostname,
+  or search string.
+
+Exit status:
+  0   Entry successfully enabled.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts enabled`
+
+```text
+Usage:
+  hosts enabled
+
+Description:
+  List all enabled entries. This is an alias for `hosts list enabled`.
+
+Exit status:
+  0   One or more enabled entries found.
+  1   Invalid parameters or no enabled entries found.
+```
+
+### `hosts file`
+
+```text
+Usage:
+  hosts file
+
+Description:
+  Print the entire contents of the /etc/hosts file.
+```
+
+### `hosts help`
+
+```text
+Usage:
+  hosts help [<command>]
+
+Description:
+  Display help information for hosts or a specified command.
+```
+
+### `hosts list`
+
+```text
+Usage:
+  hosts list [enabled | disabled | <search string>]
+
+Description:
+  List the existing IP / hostname pairs, optionally limited to a specified
+  state. When provided with a seach string, all matching enabled entries will
+  be printed.
+
+Exit status:
+  0   One or more matching entries found.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts remove`
+
+```text
+Usage:
+  hosts remove (<ip> | <hostname> | <search string>) [--force]
+  hosts remove <ip> <hostname>
+
+Options:
+  --force  Skip the confirmation prompt.
+
+Description:
+  Remove one or more entries based on a given IP address, hostname, or search
+  string. If an IP and hostname are both provided, only entries matching the
+  IP and hostname pair will be removed.
+
+Exit status:
+  0   Entry successfully removed.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts search`
+
+```text
+Usage:
+  hosts search <search string>
+
+Description:
+  Search entries for <search string>.
+
+Exit status:
+  0   One or more matching entries found.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts show`
+
+```text
+Usage:
+  hosts show (<ip> | <hostname> | <search string>)
+
+Description:
+  Print entries matching a given IP address, hostname, or search string.
+
+Exit status:
+  0   One or more matching entries found.
+  1   Invalid parameters or entry not found.
+```
+
+### `hosts subcommands`
+
+```text
+Usage:
+  hosts subcommands [--raw]
+
+Options:
+  --raw  Display the subcommands list without formatting.
+
+Description:
+  Display the list of available subcommands.
+```
+
+### `hosts unblock`
+
+```text
+Usage:
+  hosts unblock <hostname>...
+
+Description:
+  Unblock one or more hostnames by removing the entries from the hosts file.
+
+Exit status:
+  0   <hostname> successfully unblocked.
+  1   Invalid parameters or entry not found
+```
+
+### `hosts version`
+
+```text
+Usage:
+  hosts (version | --version)
+
+Description:
+  Display the current program version.
+```
+
+## Tests
+
+To run the [test suite](test), install [Bats](https://github.com/sstephenson/bats) and
+run `bats test` in the project root directory.
+
+---
+<p align="center">
+  Copyright (c) 2015-present William Melody • See LICENSE for details.
+</p>
+
+<p align="center">
+  <a href="https://github.com/xwmx/hosts">github.com/xwmx/hosts</a>
+</p>
--- a/Readme.md
+++ b/Readme.md
@ -1,120 +0,0 @@
-        __               __
-       / /_  ____  _____/ /______
-      / __ \/ __ \/ ___/ __/ ___/
-     / / / / /_/ (__  ) /_(__  )
-    /_/ /_/\____/____/\__/____/
-
-# Hosts
-
-A command line program with shortcuts for managing hosts file entries.
-
-## Installation
-
-### Homebrew
-
-To install with [Homebrew](http://brew.sh/):
-
-    brew tap alphabetum/taps && brew install alphabetum/taps/hosts
-
-### bpkg
-
-To install with [bpkg](http://www.bpkg.io/):
-
-    bpkg install alphabetum/hosts
-
-### Manual
-
-To install manually, simply add the `hosts` script to your `$PATH`. If
-you already have a `~/bin` directory, you can use the following command:
-
-    curl -L https://raw.github.com/alphabetum/hosts/master/hosts \
-      -o ~/bin/hosts && chmod +x ~/bin/hosts
-
-## Usage
-
-    Usage:
-      hosts
-      hosts add <ip> <hostname> [comment]
-      hosts remove ( <ip> | <hostname> | <search string> ) [--force]
-      hosts list [enabled | disabled | <search string>]
-      hosts show ( <ip> | <hostname> | <search string> )
-      hosts disable ( <ip> | <hostname> | <search string> )
-      hosts disabled
-      hosts enable ( <ip> | <hostname> | <search string> )
-      hosts enabled
-      hosts edit
-      hosts file
-
-For full usage, run:
-
-    hosts help
-
-For help with a particular command, try:
-
-    hosts help <command name>
-
-## Commands
-
-###### `hosts add <ip> <hostname> [comment]`
-
-Add a given IP address and hostname pair, along with an optional comment.
-
-###### `hosts remove ( <ip> | <hostname> | <search string> ) [--force]`
-
-Remove one or more records based on a given IP address, hostname, or search
-string. When the `--force` option is used, the confirmation prompt is
-supressed.
-
-###### `hosts list [enabled | disabled | <search string>]`
-
-List the existing IP / hostname pairs, optionally limited to a specified
-state. When provided with a seach string, all matching enabled records will
-be printed.
-
-###### `hosts show ( <ip> | <hostname> | <search string> )`
-
-Print entries matching a given IP address, hostname, or search string.
-
-###### `hosts disable ( <ip> | <hostname> | <search string> )`
-
-Disable one or more records based on a given ip address, hostname, or
-search string.
-
-###### `hosts disabled`
-
-List all disabled records. This is an alias for `hosts list disabled`.
-
-###### `hosts enable ( <ip> | <hostname> | <search string> )`
-
-Enable one or more disabled records based on a given ip address, hostname,
-or search string.
-
-###### `hosts enabled`
-
-List all enabled records. This is an alias for `hosts list enabled`.
-
-###### `hosts edit`
-
-Open the hosts file (/etc/hosts) file in your editor.
-
-###### `hosts file`
-
-Print the entire contents of the /etc/hosts file.
-
-## Why
-
-Although it's easy to just edit the hosts file manually, it's nice to
-have a structured way to edit it and keep things a little organized.
-
-## Acknowledgements
-
-Based on prior work by:
-
- https://github.com/nddrylliog
-  - https://gist.github.com/nddrylliog/1368532
- https://github.com/dfeyer
-  - https://gist.github.com/dfeyer/1369760
-
-Original idea and interface (since changed) via:
-
-https://github.com/macmade/host-manager
--- a/etc/README.md
+++ b/etc/README.md
@ -0,0 +1,113 @@
+# `hosts` Tab Completion
+
+## Homebrew
+
+Installing via Homebrew with `brew install xwmx/taps/hosts` will also
+install the completion scripts.
+
+A one-time setup might be needed to [enable completion for all Homebrew
+programs](https://docs.brew.sh/Shell-Completion).
+
+## npm, bpkg, Make
+
+When `hosts` is installed with `npm`, `bpkg`, or Make, an install hook will
+check the environment and attempt to install completions. If it's successful,
+you should see a message similar to:
+
+```bash
+Completion installed: /usr/local/etc/bash_completion.d/hosts
+Completion installed: /usr/local/share/zsh/site-functions/_hosts
+```
+
+If completion is working after installing through any of these methods, then
+you don't need to do anything else.
+
+## `hosts completions`
+
+The `hosts completions` subcommand can be used for installing and uninstalling
+completion scripts. Depending on your configuration, you might need to use
+`sudo` to install completion scripts easily:
+
+```bash
+> sudo hosts completions check
+Completion scripts not found.
+
+> sudo hosts completions install
+Completion script installed: /usr/share/bash-completion/completions/hosts
+Completion script installed: /usr/local/share/zsh/site-functions/_hosts
+
+> sudo hosts completions check
+Exists: /usr/share/bash-completion/completions/hosts
+Exists: /usr/local/share/zsh/site-functions/_hosts
+
+> sudo hosts completions uninstall
+Completion script removed: /usr/share/bash-completion/completions/hosts
+Completion script removed: /usr/local/share/zsh/site-functions/_hosts
+```
+
+If you installed `hosts` manually by downloading just the `hosts` script,
+the completion scripts won't be immediately available for
+`hosts completions install`. You can try installing the completions with
+the `--download` flag, which will get the latest version from GitHub:
+
+```bash
+sudo hosts completions install --download
+```
+
+`hosts completions` will try to determine the completion script directories
+from your environment. If `hosts completions` isn't able to install
+the completion scripts, you can try installing them manually.
+
+## Manual Installation
+
+### bash
+
+#### Linux
+
+On a current Linux OS (in a non-minimal installation), bash completion should
+be available.
+
+Place the completion script in `/etc/bash_completion.d/`:
+
+```bash
+sudo curl -L https://raw.githubusercontent.com/xwmx/hosts/master/hosts-completion.bash -o /etc/bash_completion.d/hosts
+```
+
+#### macOS
+
+If you aren't installing with homebrew, source the completion script in
+`.bash_profile`:
+
+```sh
+if [[ -f /path/to/hosts-completion.bash ]]
+then
+  source /path/to/hosts-completion.bash
+fi
+```
+
+### zsh
+
+Place the completion script in your `/path/to/zsh/completion` (typically
+`~/.zsh/completion/`):
+
+```bash
+$ mkdir -p ~/.zsh/completion
+$ curl -L https://raw.githubusercontent.com/xwmx/hosts/master/hosts-completion.zsh > ~/.zsh/completion/_hosts
+```
+Include the directory in your `$fpath` by adding in `~/.zshrc`:
+
+```bash
+fpath=(~/.zsh/completion $fpath)
+```
+
+Make sure `compinit` is loaded or do it by adding in `~/.zshrc`:
+
+```bash
+autoload -Uz compinit && compinit -i
+```
+
+Then reload your shell:
+
+```bash
+exec $SHELL -l
+```
--- a/etc/hosts-completion.bash
+++ b/etc/hosts-completion.bash
@ -0,0 +1,22 @@
+__hosts_subcommands() {
+  local _commands
+  _commands=($(hosts commands --raw))
+  local _completions
+  _completions=(${_commands[@]})
+
+  local _current="${COMP_WORDS[COMP_CWORD]}"
+  COMPREPLY=()
+
+
+  for __command in "${_commands[@]}"
+  do
+    if [[ -n "${__command}" ]]
+    then
+      _completions+=("${__command}")
+    fi
+  done
+
+  COMPREPLY=($(compgen -W "${_completions[*]}" -- "${_current}"))
+}
+
+complete -F __hosts_subcommands hosts
--- a/etc/hosts-completion.zsh
+++ b/etc/hosts-completion.zsh
@ -0,0 +1,26 @@
+#compdef hosts
+
+__hosts_subcommands() {
+  local _commands
+  _commands=($(hosts commands --raw))
+  local _completions
+  _completions=(${_commands[@]})
+
+  for __command in "${_commands[@]}"
+  do
+    if [[ -n "${__command}" ]]
+    then
+      _completions+=("${__command}")
+    fi
+  done
+
+  if [[ "${?}" -eq 0 ]]
+  then
+    compadd -- "${_completions[@]}"
+    return 0
+  else
+    return 1
+  fi
+}
+
+__hosts_subcommands "$@"
--- a/2165
+++ b/2165
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,5 @@
+{
+  "name": "hosts.sh",
+  "version": "3.6.4",
+  "lockfileVersion": 1
+}
--- a/package.json
+++ b/package.json
@ -1,7 +1,38 @@
 {
-  "name": "hosts",
-  "version": "2.1.3",
+  "name": "hosts.sh",
+  "version": "3.6.4",
  "description": "A command line tool for managing hosts file entries.",
  "global": true,
-  "install": "make install"
+  "install": "make install",
+  "bin": {
+    "hosts": "./hosts"
+  },
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "bats test",
+    "postinstall": "./hosts completions install",
+    "preuninstall": "./hosts completions uninstall"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/xwmx/hosts.git"
+  },
+  "author": "William Melody",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/xwmx/hosts/issues"
+  },
+  "homepage": "https://github.com/xwmx/hosts#readme",
+  "keywords": [
+    "hosts",
+    "shell",
+    "command-line",
+    "terminal",
+    "hostname",
+    "bash",
+    "cli"
+  ],
+  "dependencies": {}
 }
--- a/test/add.bats
+++ b/test/add.bats
@ -0,0 +1,182 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts add` #################################################################
+
+@test "\`add\` with no arguments exits with status 1." {
+  run "${_HOSTS}" add
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`add\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`add\` with no arguments prints help information." {
+  run "${_HOSTS}" add
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts add <ip> <hostname> [<comment>]" ]]
+}
+
+# `hosts add <ip>` ############################################################
+
+@test "\`add <ip>\` exits with status 1." {
+  run "${_HOSTS}" add 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`add <ip>\` does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`add <ip>\` prints help information." {
+  run "${_HOSTS}" add 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Please include a hostname" ]]
+  [[ "${lines[1]}" == "Usage:" ]]
+  [[ "${lines[2]}" == "  hosts add <ip> <hostname> [<comment>]" ]]
+}
+
+# `hosts add <ip> <hostname>` #################################################
+
+@test "\`add <ip> <hostname>\` exits with status 0." {
+  run "${_HOSTS}" add 0.0.0.0 example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`add <ip> <hostname>\` adds the entry to the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0 example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '0.0.0.0	example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0		example.com" ]]
+}
+
+@test "\`add <ip> <hostname>\` prints feedback." {
+  run "${_HOSTS}" add 0.0.0.0 example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Added:" ]]
+  [[ "${lines[1]}" == "0.0.0.0		example.com" ]]
+}
+
+@test "\`add <ip> <hostname>\` doesn't add duplicate entry." {
+  _original="$(cat "${HOSTS_PATH}")"
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+  }
+  _modified="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0 example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '0.0.0.0		example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_modified}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0		example.com" ]]
+}
+
+# `hosts add <ip> <hostname> [comment]` #######################################
+
+@test "\`add <ip> <hostname> [comment]\` exits with status 0." {
+  run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`add <ip> <hostname> [comment]\` adds the entry to the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == \
+      "0.0.0.0		example.com	# Example multi-word comment." ]]
+}
+
+@test "\`add <ip> <hostname> [comment]\` doesn't add duplicate entry." {
+  _original="$(cat "${HOSTS_PATH}")"
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+  }
+  _modified="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '0.0.0.0	example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_modified}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0		example.com" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" != \
+      "0.0.0.0		example.com	# Example multi-word comment." ]]
+}
+
+@test "\`add <ip> <hostname> [comment]\` doesn't add duplicate commented entry." {
+  _original="$(cat "${HOSTS_PATH}")"
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  }
+  _modified="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '0.0.0.0		example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_modified}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == \
+      "0.0.0.0		example.com	# Example multi-word comment." ]]
+}
+
+@test "\`add <ip> <hostname> [comment]\` prints feedback." {
+  run "${_HOSTS}" add 0.0.0.0 example.com 'Example multi-word comment.'
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Added:" ]]
+  [[ "${lines[1]}" == "0.0.0.0		example.com	# Example multi-word comment." ]]
+}
+
+# help ########################################################################
+
+@test "\`help add\` exits with status 0." {
+  run "${_HOSTS}" help add
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help add\` prints help information." {
+  run "${_HOSTS}" help add
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts add <ip> <hostname> [<comment>]" ]]
+}
--- a/test/backups.bats
+++ b/test/backups.bats
@ -0,0 +1,257 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts backups` #############################################################
+
+@test "\`backups\` with no backups and no arguments exits with status 0." {
+  run "${_HOSTS}" backups
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`backups\` with backups and no arguments exits with status 0." {
+  {
+    run "${_HOSTS}" backups create
+  }
+
+  run "${_HOSTS}" backups
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`backups\` with no backups and no arguments prints message." {
+  run "${_HOSTS}" backups
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${_HOSTS_TEMP_PATH}: '%s'\\n" "${_HOSTS_TEMP_PATH}"
+  printf "\${HOSTS_PATH}: '%s'\\n" "${HOSTS_PATH}"
+  _expected="\
+No backups found. Create a new backup:
+ hosts backups create"
+  [[ "${output}" == "${_expected}" ]]
+}
+
+@test "\`backups\` with backups and no arguments prints list of backups." {
+  {
+    run "${_HOSTS}" backups create
+    sleep 1
+    run "${_HOSTS}" backups create
+  }
+
+  run "${_HOSTS}" backups
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${_HOSTS_TEMP_PATH}: '%s'\\n" "${_HOSTS_TEMP_PATH}"
+  printf "\${HOSTS_PATH}: '%s'\\n" "${HOSTS_PATH}"
+  [[ "${lines[0]}" =~ hosts--backup- ]]
+  [[ "${lines[1]}" =~ hosts--backup- ]]
+}
+
+# `hosts backups create` ######################################################
+
+@test "\`backups create\` exits with status 0." {
+  run "${_HOSTS}" backups create
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`backups create\` creates backup." {
+  run "${_HOSTS}" backups create
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+  printf "\${_backup_path}: '%s'\\n" "${_backup_path}"
+  [[ -e "${_backup_path}" ]]
+}
+
+@test "\`backups create\` prints message." {
+  run "${_HOSTS}" backups create
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${output} =~ 'Backed up to' ]]
+}
+
+# `hosts backups compare` #####################################################
+
+@test "\`backups compare\` with valid backup exits with status 1 and prints." {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+    run "${_HOSTS}" add 0.0.0.0 example.com
+  }
+
+  run "${_HOSTS}" backups compare "${_backup_basename}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${lines[1]}: '%s'\\n" "${lines[1]}"
+  [[ ${status} -eq 1 ]]
+  [[ "${lines[2]}" == '@@ -8,4 +8,3 @@' ]]
+}
+
+@test "\`backups compare\` with missing backup exits with status 1" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+    run "${_HOSTS}" add 0.0.0.0 example.com
+  }
+
+  run "${_HOSTS}" backups compare
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+  [[ "${lines[0]}" =~ 'Usage' ]]
+}
+
+@test "\`backups compare\` with invalid backup exits with status 1" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+    run "${_HOSTS}" add 0.0.0.0 example.com
+  }
+
+  run "${_HOSTS}" backups compare "invalid-backup-name"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+  [[ ${output} =~ 'Backup not found' ]]
+}
+
+# `hosts backups delete` ######################################################
+
+@test "\`backups delete\` with valid backup exits with status 0 and deletes backup" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    [[ -e "${_backup_path}" ]]
+    _backup_basename="$(basename "${_backup_path}")"
+  }
+
+  run "${_HOSTS}" backups delete "${_backup_basename}"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+  [[ ! -e "${_backup_path}" ]]
+  [[ ${output} =~ 'Backup deleted' ]]
+}
+
+@test "\`backups delete\` with invalid backup exits with status 1" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+  }
+
+  run "${_HOSTS}" backups delete "invalid-backup-name"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+  [[ -e "${_backup_path}" ]]
+  [[ ${output} =~ 'Backup not found' ]]
+}
+
+# `hosts backups restore` #####################################################
+
+@test "\`backups restore\` with valid backup exits with status 0 and restores" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    sleep 1
+  }
+
+  run "${_HOSTS}" backups restore "${_backup_basename}"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${lines[0]}: '%s'\\n" "${lines[0]}"
+  [[ ${status} -eq 0 ]]
+  [[ "${lines[0]}" =~ 'Backed up to' ]]
+  [[ "${lines[1]}" =~ 'Restored from backup' ]]
+
+  _new_backup_path="$(echo "${lines[0]}" | sed -e 's/Backed up to \(.*\)/\1/')"
+
+  printf "\${_backup_path}: '%s'\\n" "${_backup_path}"
+  printf "\${_new_backup_path}: '%s'\\n" "${_new_backup_path}"
+
+  _new_backup_content="$(cat "${_new_backup_path}")"
+  _old_backup_content="$(cat "${_backup_path}")"
+  _current_content="$(cat "${HOSTS_PATH}")"
+
+  [[ "${_new_backup_content}" != "${_current_content}" ]]
+  [[ "${_old_backup_content}" == "${_current_content}" ]]
+}
+
+@test "\`backups restore --skip-backup\` with valid backup exits with status 0 and restores" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    _replaced_content="$(cat "${HOSTS_PATH}")"
+    sleep 1
+  }
+
+  run "${_HOSTS}" backups restore "${_backup_basename}" --skip-backup
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${lines[0]}: '%s'\\n" "${lines[0]}"
+  [[ ${status} -eq 0 ]]
+  [[ "${lines[0]}" =~ 'Restored from backup' ]]
+
+  _old_backup_content="$(cat "${_backup_path}")"
+  _current_content="$(cat "${HOSTS_PATH}")"
+
+  [[ "${_replaced_content}"   != "${_current_content}" ]]
+  [[ "${_old_backup_content}" == "${_current_content}" ]]
+}
+
+@test "\`backups restore\` with invalid backup exits with status 1" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+  }
+
+  run "${_HOSTS}" backups restore "invalid-backup-name"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+  [[ ${output} =~ 'Backup not found' ]]
+}
+
+# `hosts backups show` ########################################################
+
+@test "\`backups show\` with valid backup exits with status 0 and prints." {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    [[ -e "${_backup_path:-}" ]]
+    _backup_basename="$(basename "${_backup_path}")"
+  }
+
+  run "${_HOSTS}" backups show "${_backup_basename}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${lines[6]}: '%s'\\n" "${lines[6]}"
+  [[ ${status} -eq 0 ]]
+  [[ "${lines[6]}" == '127.0.0.1	localhost' ]]
+}
+
+@test "\`backups show\` with invalid backup exits with status 1" {
+  {
+    run "${_HOSTS}" backups create
+    _backup_path="$(echo "${output}" | sed -e 's/Backed up to \(.*\)/\1/')"
+    _backup_basename="$(basename "${_backup_path}")"
+  }
+
+  run "${_HOSTS}" backups show "invalid-backup-name"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+  [[ ${output} =~ 'Backup not found' ]]
+}
--- a/test/block.bats
+++ b/test/block.bats
@ -0,0 +1,118 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts block` ###############################################################
+
+@test "\`block\` with no arguments exits with status 1." {
+  run "${_HOSTS}" block
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`block\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" block
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`block\` with no arguments prints help information." {
+  run "${_HOSTS}" block
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts block <hostname>..." ]]
+}
+
+# `hosts block <hostname>` ####################################################
+
+@test "\`block <hostname>\` exits with status 0." {
+  run "${_HOSTS}" block example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`block <hostname>\` adds entries to the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" block example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '127.0.0.1	example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example.com ]]
+}
+
+@test "\`block <hostname>\` prints feedback." {
+  run "${_HOSTS}" block example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Added:" ]]
+  [[ "${lines[1]}" =~ 127.0.0.1[[:space:]]+example.com ]]
+  [[ "${lines[2]}" == "Added:" ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]example.com ]]
+  [[ "${lines[4]}" == "Added:" ]]
+  [[ "${lines[5]}" =~ \:\:1[[:space:]]+example.com ]]
+}
+
+# `hosts block <hostname> <hostname2>` ########################################
+
+@test "\`block <hostname> <hostname2>\` exits with status 0." {
+  run "${_HOSTS}" block example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`block <hostname> <hostname2>\` adds entries to the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" block example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  _compare '127.0.0.1	example.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  _compare '127.0.0.1	example2.com' "$(sed -n '11p' "${HOSTS_PATH}")"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example.com ]]
+  [[ "$(sed -n '14p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example2.com ]]
+}
+
+@test "\`block <hostname> <hostname2>\` prints feedback." {
+  run "${_HOSTS}" block example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Added:" ]]
+  [[ "${lines[1]}" =~ 127.0.0.1[[:space:]]+example.com ]]
+  [[ "${lines[2]}" == "Added:" ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]+example.com ]]
+  [[ "${lines[4]}" == "Added:" ]]
+  [[ "${lines[5]}" =~ \:\:1[[:space:]]+example.com ]]
+  [[ "${lines[6]}" == "Added:" ]]
+  [[ "${lines[7]}" =~ 127.0.0.1[[:space:]]+example2.com ]]
+  [[ "${lines[8]}" == "Added:" ]]
+  [[ "${lines[9]}" =~ fe80\:\:1\%lo0[[:space:]]+example2.com ]]
+  [[ "${lines[10]}" == "Added:" ]]
+  [[ "${lines[11]}" =~ \:\:1[[:space:]]+example2.com ]]
+}
+
+# help ########################################################################
+
+@test "\`help block\` exits with status 0." {
+  run "${_HOSTS}" help block
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help block\` prints help information." {
+  run "${_HOSTS}" help block
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts block <hostname>..." ]]
+}
--- a/test/disable.bats
+++ b/test/disable.bats
@ -0,0 +1,158 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts disable` #############################################################
+
+@test "\`disable\` with no arguments exits with status 1." {
+  run "${_HOSTS}" disable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`disable\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" disable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`disable\` with no arguments prints help information." {
+  run "${_HOSTS}" disable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts disable (<ip> | <hostname> | <search string>)" ]]
+}
+
+# `hosts disable <ip>` ########################################################
+
+@test "\`disable <ip>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" disable 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`disable <ip>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" disable 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled\:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example.net ]]
+}
+
+@test "\`disable <ip>\` disables all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" disable 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled\:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ \#disabled\:\ 0.0.0.0[[:space:]]+example.net ]]
+}
+
+@test "\`disable <ip>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" disable 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Disabling:" ]]
+  [[ "${lines[1]}" =~ 0.0.0.0[[:space:]]+example.com ]]
+}
+
+# `hosts disable <hostname>` ##################################################
+
+@test "\`disable <hostname>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" disable example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`disable <hostname>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" disable example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled\:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example.net ]]
+}
+
+@test "\`disable <hostname>\` disables all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" disable example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled\:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 127.0.0.1[[:space:]]+example.com ]]
+}
+
+@test "\`disable <hostname>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" disable example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Disabling:" ]]
+  [[ "${lines[1]}" =~ 0.0.0.0[[:space:]]+example.com ]]
+}
+
+# help ########################################################################
+
+@test "\`help disable\` exits with status 0." {
+  run "${_HOSTS}" help disable
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help disable\` prints help information." {
+  run "${_HOSTS}" help disable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts disable (<ip> | <hostname> | <search string>)" ]]
+}
--- a/test/disabled.bats
+++ b/test/disabled.bats
@ -0,0 +1,57 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts disabled` ############################################################
+
+@test "\`disabled\` with no arguments exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`disabled\` with no arguments prints list of disabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.com ]]
+  [[ "${lines[1]}" =~ 127\.0\.0\.1[[:space:]]+example\.com ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`disabled\` exits with status 1 when no matching entries found." {
+  run "${_HOSTS}" disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# help ########################################################################
+
+@test "\`help disabled\` exits with status 0." {
+  run "${_HOSTS}" help disabled
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help disabled\` prints help information." {
+  run "${_HOSTS}" help disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts disabled" ]]
+}
--- a/test/enable.bats
+++ b/test/enable.bats
@ -0,0 +1,205 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts enable` ##############################################################
+
+@test "\`enable\` with no arguments exits with status 1." {
+  run "${_HOSTS}" enable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`enable\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" enable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`enable\` with no arguments prints help information." {
+  run "${_HOSTS}" enable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts enable (<ip> | <hostname> | <search string>)" ]]
+}
+
+# `hosts enable <ip>` #########################################################
+
+@test "\`enable <ip>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 127.0.0.2
+  }
+
+  run "${_HOSTS}" enable 127.0.0.2
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`enable <ip>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+    run "${_HOSTS}" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" enable 127.0.0.2
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ \#disabled:\ 0.0.0.0[[:space:]]+example.net ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+@test "\`enable <ip>\` enables all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+    run "${_HOSTS}" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" enable 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare \
+    "${_original}" \
+    "$(cat "${HOSTS_PATH}")"
+  _compare \
+    "'0.0.0.0	example.com'" \
+    "'$(sed -n '11p' "${HOSTS_PATH}")'"
+  _compare \
+    "'0.0.0.0	example.net'" \
+    "'$(sed -n '12p' "${HOSTS_PATH}")'"
+  _compare \
+    "'#disabled: 127.0.0.2	example.com'" \
+    "'$(sed -n '13p' "${HOSTS_PATH}")'"
+
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.net ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" =~ \#disabled:\ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+@test "\`enable <ip>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 127.0.0.2
+  }
+
+  run "${_HOSTS}" enable 127.0.0.2
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Enabling:" ]]
+  [[ "${lines[1]}" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+# `hosts enable <hostname>` ###################################################
+
+@test "\`enable <hostname>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" enable example.net
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`enable <hostname>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" enable example.net
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ \#disabled:\ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.net ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+@test "\`enable <hostname>\` enables all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+    run "${_HOSTS}" disable 127.0.0.2
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" enable example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare \
+    "${_original}" \
+    "$(cat "${HOSTS_PATH}")"
+  _compare \
+    "'0.0.0.0	example.com'" \
+    "'$(sed -n '11p' "${HOSTS_PATH}")'"
+  _compare \
+    "'#disabled: 0.0.0.0	example.net'" \
+    "'$(sed -n '12p' "${HOSTS_PATH}")'"
+  _compare \
+    "'127.0.0.2	example.com'" \
+    "'$(sed -n '13p' "${HOSTS_PATH}")'"
+
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.com ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ \#disabled:\ 0.0.0.0[[:space:]]+example.net ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+@test "\`enable <hostname>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" enable example.net
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Enabling:" ]]
+  [[ "${lines[1]}" =~ 0.0.0.0[[:space:]]+example.net ]]
+}
+
+# help ########################################################################
+
+@test "\`help enable\` exits with status 0." {
+  run "${_HOSTS}" help enable
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help enable\` prints help information." {
+  run "${_HOSTS}" help enable
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts enable (<ip> | <hostname> | <search string>)" ]]
+}
--- a/test/enabled.bats
+++ b/test/enabled.bats
@ -0,0 +1,64 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts enabled` #############################################################
+
+@test "\`enabled\` with no arguments exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`enabled\` with no arguments prints list of enabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 127.0.0.1[[:space:]]+localhost ]]
+  [[ "${lines[1]}" =~ 255.255.255.255[[:space:]]+broadcasthost ]]
+  [[ "${lines[2]}" =~ \:\:1[[:space:]]+localhost ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]+localhost ]]
+  [[ "${lines[4]}" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+@test "\`enabled\` exits with status 1 when no matching entries found." {
+  {
+    run "${_HOSTS}" disable localhost
+    run "${_HOSTS}" disable broadcasthost
+  }
+
+  run "${_HOSTS}" enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# help ########################################################################
+
+@test "\`help enabled\` exits with status 0." {
+  run "${_HOSTS}" help enabled
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help enabled\` prints help information." {
+  run "${_HOSTS}" help enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts enabled" ]]
+}
--- a/test/file.bats
+++ b/test/file.bats
@ -0,0 +1,28 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "\`file\` exits with status 0." {
+  run "${_HOSTS}" file
+  [ "${status}" -eq 0 ]
+}
+
+@test "\`file\` prints \$HOSTS_PATH contents." {
+  run "${_HOSTS}" file
+  [[ "${output}" == "$(cat ${HOSTS_PATH})" ]]
+}
+
+# help ########################################################################
+
+@test "\`help file\` exits with status 0." {
+  run "${_HOSTS}" help file
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help file\` prints help information." {
+  run "${_HOSTS}" help file
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts file" ]]
+}
--- a/test/fixtures/bin/hosts
+++ b/test/fixtures/bin/hosts
@ -0,0 +1 @@
+#!/usr/bin/env bash
--- a/test/fixtures/hosts
+++ b/test/fixtures/hosts
@ -0,0 +1,10 @@
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1	localhost
+255.255.255.255	broadcasthost
+::1             localhost
+fe80::1%lo0	localhost
--- a/test/help.bats
+++ b/test/help.bats
@ -0,0 +1,48 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+_HELP_HEADER="$(
+  cat <<HEREDOC
+    __               __
+   / /_  ____  _____/ /______
+  / __ \/ __ \/ ___/ __/ ___/
+ / / / / /_/ (__  ) /_(__  )
+/_/ /_/\____/____/\__/____/
+HEREDOC
+)"
+export _HELP_HEADER
+
+@test "\`help\` with no arguments exits with status 0." {
+  run "${_HOSTS}" help
+  [ "${status}" -eq 0 ]
+}
+
+@test "\`help\` with no arguments prints default help." {
+  run "${_HOSTS}" help
+  [[ $(IFS=$'\n'; echo "${lines[*]:0:5}") == "${_HELP_HEADER}" ]]
+}
+
+@test "\`hosts -h\` prints default help." {
+  run "${_HOSTS}" -h
+  [[ $(IFS=$'\n'; echo "${lines[*]:0:5}") == "${_HELP_HEADER}" ]]
+}
+
+@test "\`hosts --help\` prints default help." {
+  run "${_HOSTS}" --help
+  [[ $(IFS=$'\n'; echo "${lines[*]:0:5}") == "${_HELP_HEADER}" ]]
+}
+
+@test "\`hosts help help\` prints \`help\` subcommand usage." {
+  run "${_HOSTS}" help help
+  _expected="$(
+    cat <<HEREDOC
+Usage:
+  hosts help [<command>]
+
+Description:
+  Display help information for hosts or a specified command.
+HEREDOC
+  )"
+  [[ "${output}" == "${_expected}" ]]
+}
--- a/test/hosts.bats
+++ b/test/hosts.bats
@ -0,0 +1,18 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "\`hosts\` with no arguments exits with status 0." {
+  run "${_HOSTS}"
+  [ "${status}" -eq 0 ]
+}
+
+@test "\`hosts\` with no arguments prints enabled rules." {
+  run "${_HOSTS}"
+  [[ "${#lines[@]}" -eq 4 ]]
+  [[ "${lines[0]}" =~ 127.0.0.1[[:space:]]+localhost            ]]
+  [[ "${lines[1]}" =~ 255.255.255.255[[:space:]]+broadcasthost  ]]
+  [[ "${lines[2]}" =~ \:\:1[[:space:]]+localhost                ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]+localhost       ]]
+  [[ "${lines[4]}" == "" ]]
+}
--- a/test/list.bats
+++ b/test/list.bats
@ -0,0 +1,214 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts list` ################################################################
+
+@test "\`list\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" list
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`list\` prints lists of enabled and disabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" list
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+127.0.0.1	  localhost
+255.255.255.255	  broadcasthost
+::1		  localhost
+fe80::1%lo0	  localhost
+127.0.0.2	  example.com
+
+Disabled:
+---------
+0.0.0.0	  example.com
+0.0.0.0	  example.net"
+  _compare "'${_expected}'" "'${output}'"
+  [[ "${output}" == "${_expected}" ]]
+}
+
+# `hosts list enabled` ########################################################
+
+@test "\`list enabled\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" list enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`list enabled\` prints list of enabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" list enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 127\.0\.0\.1[[:space:]]+localhost           ]]
+  [[ "${lines[1]}" =~ 255\.255\.255\.255[[:space:]]+broadcasthost ]]
+  [[ "${lines[2]}" =~ \:\:1[[:space:]]+localhost                  ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]+localhost         ]]
+  [[ "${lines[4]}" =~ 127\.0\.0\.2[[:space:]]+example.com         ]]
+}
+
+@test "\`list enabled\` exits with status 1 when no matching entries found." {
+  {
+    run "${_HOSTS}" disable localhost
+    run "${_HOSTS}" disable broadcasthost
+  }
+
+  run "${_HOSTS}" list enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# `hosts list disabled` #######################################################
+
+@test "\`list disabled\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" list disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`list disabled\` prints list of disabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" list disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.com ]]
+  [[ "${lines[1]}" =~ 127\.0\.0\.1[[:space:]]+example\.com ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`list disabled\` exits with status 1 when no matching entries found." {
+  run "${_HOSTS}" list disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# `hosts list <search string>` ################################################
+
+@test "\`list <search string>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" list example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`list <search string>\` prints list of matching entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" list example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.com ]]
+  [[ "${lines[1]}" =~ 127\.0\.0\.1[[:space:]]+example\.com ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`list <search string>\` prints entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" list "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.net[[:space:]]+\#\ Example\ Comment ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+
+@test "\`list <search string>\` prints disabled entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.biz "Example Comment"
+    run "${_HOSTS}" disable example.biz
+  }
+
+  run "${_HOSTS}" list "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.net[[:space:]]+\#\ Example\ Comment ]]
+  [[ "${lines[3]}" =~ 127\.0\.0\.1[[:space:]]+example\.biz[[:space:]]+\#\ Example\ Comment ]]
+  [[ "${lines[4]}" == "" ]]
+}
+
+@test "\`list <search string>\` exits with status 1 when no matching entries found." {
+  run "${_HOSTS}" list query-that-matches-no-entries
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# help ########################################################################
+
+@test "\`help list\` exits with status 0." {
+  run "${_HOSTS}" help list
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help list\` prints help information." {
+  run "${_HOSTS}" help list
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts list [enabled | disabled | <search string>]" ]]
+}
--- a/test/remove.bats
+++ b/test/remove.bats
@ -0,0 +1,227 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts remove` ##############################################################
+
+@test "\`remove\` with no arguments exits with status 1." {
+  run "${_HOSTS}" remove
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`remove\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" remove
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`remove\` with no arguments prints help information." {
+  run "${_HOSTS}" remove
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts remove (<ip> | <hostname> | <search string>) [--force]" ]]
+}
+
+# `hosts remove <invalid> --force` ############################################
+
+@test "\`remove <invalid> --force\` exits with status 1." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove 127.0.0.3 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`remove <invalid> --force\` prints error message." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove 127.0.0.3 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${output} == "${_ERROR_PREFIX}No matching entries found." ]]
+}
+
+# `hosts remove <ip> --force` #################################################
+
+@test "\`remove <ip> --force\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove 127.0.0.2 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`remove <ip> --force\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" remove 127.0.0.2 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.com  ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.net  ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == ""                              ]]
+}
+
+@test "\`remove <ip>\` removes all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 0.0.0.0 example.dev
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable example.dev
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" remove 0.0.0.0 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1	localhost
+255.255.255.255	broadcasthost
+::1             localhost
+fe80::1%lo0	localhost
+127.0.0.2	example.com"
+  _compare "'${_expected}'" "'$(cat "${HOSTS_PATH}")'"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_expected}" ]]
+}
+
+@test "\`remove <ip>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove 127.0.0.2 --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Removed:" ]]
+  [[ "${lines[1]}" =~ 127.0.0.2[[:space:]]+example.com ]]
+}
+
+# `hosts remove <hostname> --force` ###########################################
+
+@test "\`remove <hostname> --force\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove example.com --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`remove <hostname> --force\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" remove example.com --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" =~ 0.0.0.0[[:space:]]+example.net ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "" ]]
+}
+
+@test "\`remove <hostname>\` removes all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 0.0.0.0 example.dev
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable example.dev
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" remove example.com --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1	localhost
+255.255.255.255	broadcasthost
+::1             localhost
+fe80::1%lo0	localhost
+0.0.0.0		example.net
+#disabled: 0.0.0.0		example.dev"
+  _compare "'${_expected}'" "'$(cat "${HOSTS_PATH}")'"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_expected}" ]]
+}
+
+@test "\`remove <hostname>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+  }
+
+  run "${_HOSTS}" remove example.com --force
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+Removed:
+0.0.0.0		example.com
+127.0.0.2	example.com"
+  [[ "${output}" == "${_expected}" ]]
+}
+
+# help ########################################################################
+
+@test "\`help remove\` exits with status 0." {
+  run "${_HOSTS}" help remove
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help remove\` prints help information." {
+  run "${_HOSTS}" help remove
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts remove (<ip> | <hostname> | <search string>) [--force]" ]]
+}
--- a/test/search.bats
+++ b/test/search.bats
@ -0,0 +1,202 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts search` ##############################################################
+
+@test "\`search\` with no arguments exits with status 1." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" search
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`search\` with no arguments prints help information." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" search
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:"                          ]]
+  [[ "${lines[1]}" == "  hosts search <search string>"  ]]
+}
+
+# `hosts search enabled` ######################################################
+
+@test "\`search enabled\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" search enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`search enabled\` prints list of enabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" search enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 127.0.0.1[[:space:]]+localhost            ]]
+  [[ "${lines[1]}" =~ 255.255.255.255[[:space:]]+broadcasthost  ]]
+  [[ "${lines[2]}" =~ \:\:1[[:space:]]+localhost                ]]
+  [[ "${lines[3]}" =~ fe80\:\:1\%lo0[[:space:]]+localhost       ]]
+  [[ "${lines[4]}" =~ 127.0.0.2[[:space:]]+example.com          ]]
+}
+
+@test "\`search enabled\` exits with status 1 when no matching entries found." {
+  {
+    run "${_HOSTS}" disable localhost
+    run "${_HOSTS}" disable broadcasthost
+  }
+
+  run "${_HOSTS}" search enabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# `hosts search disabled` #####################################################
+
+@test "\`search disabled\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" search disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`search disabled\` prints list of disabled entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" search disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0.0.0.0[[:space:]]+example.com    ]]
+  [[ "${lines[1]}" =~ 127.0.0.1[[:space:]]+example.com  ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`search disabled\` exits with status 1 when no matching entries found." {
+  run "${_HOSTS}" search disabled
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# `hosts search <search string>` ################################################
+
+@test "\`search <search string>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" search example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`search <search string>\` prints list of matching entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" search example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0.0.0.0[[:space:]]+example.com    ]]
+  [[ "${lines[1]}" =~ 127.0.0.1[[:space:]]+example.com  ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`search <search string>\` prints entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" search "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0.0.0.0[[:space:]]+example.net[[:space:]]+\#\ Example\ Comment ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`search <search string>\` prints disabled entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.biz "Example Comment"
+    run "${_HOSTS}" disable example.biz
+  }
+
+  run "${_HOSTS}" search "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0.0.0.0[[:space:]]+example.net[[:space:]]+\#\ Example\ Comment    ]]
+  [[ "${lines[3]}" =~ 127.0.0.1[[:space:]]+example.biz[[:space:]]+\#\ Example\ Comment  ]]
+  [[ "${lines[4]}" == "" ]]
+}
+
+@test "\`search <search string>\` exits with status 1 when no matching entries found." {
+  run "${_HOSTS}" search query-that-matches-no-entries
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+# help ########################################################################
+
+@test "\`help search\` exits with status 0." {
+  run "${_HOSTS}" help search
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help search\` prints help information." {
+  run "${_HOSTS}" help search
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:"                          ]]
+  [[ "${lines[1]}" == "  hosts search <search string>"  ]]
+}
--- a/test/show.bats
+++ b/test/show.bats
@ -0,0 +1,142 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts show` ################################################################
+
+@test "\`show\` with no arguments exits with status 1." {
+  run "${_HOSTS}" show
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`show\` with no arguments prints help information." {
+  run "${_HOSTS}" show
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts show (<ip> | <hostname> | <search string>)" ]]
+}
+
+# `hosts show <no matching>` ##################################################
+
+@test "\`show <query>\` with no matching entries with status 1." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" show bad-query
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+
+  [[ "${lines[0]}" =~ No\ matching\ entries ]]
+}
+
+# `hosts show <ip>` ###########################################################
+
+@test "\`show <ip>\` exits with status 0 and shows all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable example.com
+  }
+
+  run "${_HOSTS}" show 0.0.0.0
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example.net ]]
+  [[ "${lines[3]}" =~ 0\.0\.0\.0[[:space:]]+example.com ]]
+}
+
+# `hosts show <hostname>` #####################################################
+
+@test "\`show <hostname>\` exits with status 0 and shows all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.2 example.com
+    run "${_HOSTS}" disable 0.0.0.0
+  }
+
+  run "${_HOSTS}" show example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+
+  [[ "${lines[0]}" =~ 127\.0\.0\.2[[:space:]]+example.com ]]
+  [[ "${lines[3]}" =~ 0\.0\.0\.0[[:space:]]+example.com   ]]
+}
+
+# `hosts show <search string>` ################################################
+
+@test "\`show <search string>\` exits with status 0 and shows matching entries." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" show example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example.com   ]]
+  [[ "${lines[1]}" =~ 127\.0\.0\.1[[:space:]]+example.com ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`show <search string>\` prints entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+  }
+
+  run "${_HOSTS}" show "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  printf "\${lines[0]}: '%s'\\n" "${lines[0]}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.net[[:space:]]+\#\ Example\ Comment ]]
+  [[ "${lines[2]}" == "" ]]
+}
+
+@test "\`show <search string>\` prints disabled entries with matching comments." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" add 0.0.0.0 example.net "Example Comment"
+    run "${_HOSTS}" add 127.0.0.1 example.com
+    run "${_HOSTS}" add 127.0.0.1 example.biz "Example Comment"
+    run "${_HOSTS}" disable example.biz
+  }
+
+  run "${_HOSTS}" show "Comment"
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" =~ 0\.0\.0\.0[[:space:]]+example\.net[[:space:]]+\#\ Example\ Comment    ]]
+  [[ "${lines[3]}" =~ 127\.0\.0\.1[[:space:]]+example\.biz[[:space:]]+\#\ Example\ Comment  ]]
+  [[ "${lines[4]}" == "" ]]
+}
+
+# help ########################################################################
+
+@test "\`help show\` exits with status 0." {
+  run "${_HOSTS}" help show
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help show\` prints help information." {
+  run "${_HOSTS}" help show
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts show (<ip> | <hostname> | <search string>)" ]]
+}
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@ -0,0 +1,59 @@
+###############################################################################
+# test_helper.bash
+#
+# Test helper for Bats: Bash Automated Testing System.
+#
+# https://github.com/sstephenson/bats
+###############################################################################
+
+setup() {
+  # `$_HOSTS`
+  #
+  # The location of the `hosts` script being tested.
+  export _HOSTS="${BATS_TEST_DIRNAME}/../hosts"
+
+  export _HOSTS_TEMP_DIR
+  _HOSTS_TEMP_DIR="$(mktemp -d)"
+
+  export _HOSTS_TEMP_PATH
+  _HOSTS_TEMP_PATH="${_HOSTS_TEMP_DIR}/hosts"
+
+  export _ERROR_PREFIX
+  _ERROR_PREFIX="$(tput setaf 1)!$(tput sgr0) "
+
+  cat "${BATS_TEST_DIRNAME}/fixtures/hosts" > "${_HOSTS_TEMP_PATH}"
+
+  export HOSTS_PATH="${_HOSTS_TEMP_PATH}"
+
+  # Use empty `hosts` script in environment to avoid depending on `hosts`
+  # being available in `$PATH`.
+  export PATH="${BATS_TEST_DIRNAME}/fixtures/bin:${PATH}"
+}
+
+teardown() {
+  if [[ -n "${_HOSTS_TEMP_PATH}" ]] &&
+     [[ -e "${_HOSTS_TEMP_PATH}" ]] &&
+     [[ "${_HOSTS_TEMP_PATH}" =~ ^/tmp/hosts_test ]]
+  then
+    rm -f "${_HOSTS_TEMP_DIR}"/hosts_test.*
+  fi
+}
+
+###############################################################################
+# Helpers
+###############################################################################
+
+# _compare()
+#
+# Usage:
+#   _compare <expected> <actual>
+#
+# Description:
+#   Compare the content of a variable against an expected value. When used
+#   within a `@test` block the output is only displayed when the test fails.
+_compare() {
+  local _expected="${1:-}"
+  local _actual="${2:-}"
+  printf "expected:\\n%s\\n" "${_expected}"
+  printf "actual:\\n%s\\n" "${_actual}"
+}
--- a/test/unblock.bats
+++ b/test/unblock.bats
@ -0,0 +1,242 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+# `hosts unblock` #############################################################
+
+@test "\`unblock\` with no arguments exits with status 1." {
+  run "${_HOSTS}" unblock
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`unblock\` with no argument does not change the hosts file." {
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" unblock
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "$(cat "${HOSTS_PATH}")" == "${_original}" ]]
+}
+
+@test "\`unblock\` with no arguments prints help information." {
+  run "${_HOSTS}" unblock
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts unblock <hostname>..." ]]
+}
+
+# `hosts unblock <invalid>` ###################################################
+
+@test "\`unblock <invalid> \` exits with status 1." {
+  {
+    run "${_HOSTS}" block example.com
+  }
+
+  run "${_HOSTS}" unblock example.net
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 1 ]]
+}
+
+@test "\`unblock <invalid>\` prints error message." {
+  {
+    run "${_HOSTS}" block example.com
+  }
+
+  run "${_HOSTS}" unblock example.net
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${output} == "${_ERROR_PREFIX}No matching entries found." ]]
+}
+
+# `hosts unblock <hostname>` ##################################################
+
+@test "\`unblock <hostname>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" unblock example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`unblock <hostname>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" unblock example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0		example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "127.0.0.1	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "" ]]
+}
+
+@test "\`unblock <hostname>\` removes all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" unblock example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1	localhost
+255.255.255.255	broadcasthost
+::1             localhost
+fe80::1%lo0	localhost
+0.0.0.0		example.com
+127.0.0.1	example.net"
+  _compare "'${_expected}'" "'$(cat "${HOSTS_PATH}")'"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_expected}" ]]
+}
+
+@test "\`unblock <hostname>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" unblock example.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+Removed:
+127.0.0.1	example.com
+Removed:
+fe80::1%lo0	example.com
+Removed:
+::1		example.com"
+  [[ "${output}" == "${_expected}" ]]
+}
+
+# `hosts unblock <hostname> <hostname2>` ######################################
+
+@test "\`unblock <hostname> <hostname2>\` exits with status 0." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" block example2.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" unblock example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`unblock <hostname> <hostname2>\` updates the hosts file." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" block example2.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" unblock example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _compare "${_original}" "$(cat "${HOSTS_PATH}")"
+  [[ "$(sed -n '11p' "${HOSTS_PATH}")" == "0.0.0.0		example.com" ]]
+  [[ "$(sed -n '12p' "${HOSTS_PATH}")" == "127.0.0.1	example.net" ]]
+  [[ "$(sed -n '13p' "${HOSTS_PATH}")" == "" ]]
+}
+
+@test "\`unblock <hostname> <hostname2>\` removes all matches." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" block example2.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+  _original="$(cat "${HOSTS_PATH}")"
+
+  run "${_HOSTS}" unblock example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+##
+# Host Database
+#
+# localhost is used to configure the loopback interface
+# when the system is booting.  Do not change this entry.
+##
+127.0.0.1	localhost
+255.255.255.255	broadcasthost
+::1             localhost
+fe80::1%lo0	localhost
+0.0.0.0		example.com
+127.0.0.1	example.net"
+  _compare "'${_expected}'" "'$(cat "${HOSTS_PATH}")'"
+  [[ "$(cat "${HOSTS_PATH}")" != "${_original}" ]]
+  [[ "$(cat "${HOSTS_PATH}")" == "${_expected}" ]]
+}
+
+@test "\`unblock <hostname> <hostname2>\` prints feedback." {
+  {
+    run "${_HOSTS}" add 0.0.0.0 example.com
+    run "${_HOSTS}" block example.com
+    run "${_HOSTS}" block example2.com
+    run "${_HOSTS}" add 127.0.0.1 example.net
+  }
+
+  run "${_HOSTS}" unblock example.com example2.com
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  _expected="\
+Removed:
+127.0.0.1	example.com
+Removed:
+fe80::1%lo0	example.com
+Removed:
+::1		example.com
+Removed:
+127.0.0.1	example2.com
+Removed:
+fe80::1%lo0	example2.com
+Removed:
+::1		example2.com"
+  _compare "'${output}'" "'${_expected}'"
+  diff  <(echo "${output}" ) <(echo "${_expected}")
+  [[ "${output}" == "${_expected}" ]]
+}
+
+# help ########################################################################
+
+@test "\`help unblock\` exits with status 0." {
+  run "${_HOSTS}" help unblock
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help unblock\` prints help information." {
+  run "${_HOSTS}" help unblock
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts unblock <hostname>..." ]]
+}
--- a/test/version.bats
+++ b/test/version.bats
@ -0,0 +1,40 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "\`hosts version\` returns with 0 status." {
+  run "${_HOSTS}" version
+  [[ "${status}" -eq 0 ]]
+}
+
+@test "\`hosts version\` prints a version number." {
+  run "${_HOSTS}" version
+  printf "'%s'" "${output}"
+  echo "${output}" | grep -q '[[:digit:]]\+\.[[:digit:]]\+\.[[:digit:]]\+'
+}
+
+@test "\`hosts --version\` returns with 0 status." {
+  run "${_HOSTS}" --version
+  [[ "${status}" -eq 0 ]]
+}
+
+@test "\`hosts --version\` prints a version number." {
+  run "${_HOSTS}" --version
+  printf "'%s'" "${output}"
+  echo "${output}" | grep -q '[[:digit:]]\+\.[[:digit:]]\+\.[[:digit:]]\+'
+}
+
+# help ########################################################################
+
+@test "\`help version\` exits with status 0." {
+  run "${_HOSTS}" help version
+  [[ ${status} -eq 0 ]]
+}
+
+@test "\`help version\` prints help information." {
+  run "${_HOSTS}" help version
+  printf "\${status}: %s\\n" "${status}"
+  printf "\${output}: '%s'\\n" "${output}"
+  [[ "${lines[0]}" == "Usage:" ]]
+  [[ "${lines[1]}" == "  hosts (version | --version)" ]]
+}