fzf/README.md

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<img src="https://raw.githubusercontent.com/junegunn/i/master/fzf.png" height="170" alt="fzf - a command-line fuzzy finder"> [![travis-ci](https://travis-ci.org/junegunn/fzf.svg?branch=master)](https://travis-ci.org/junegunn/fzf)
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===
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fzf is a general-purpose command-line fuzzy finder.
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<img src="https://raw.githubusercontent.com/junegunn/i/master/fzf-preview.png" width=640>
It's an interactive Unix filter for command-line that can be used with any
list; files, command history, processes, hostnames, bookmarks, git commits,
etc.
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Pros
----
- Portable, no dependencies
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- Blazingly fast
- The most comprehensive feature set
- Flexible layout
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- Batteries included
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- Vim/Neovim plugin, key bindings and fuzzy auto-completion
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Table of Contents
-----------------
* [Installation](#installation)
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* [Using Homebrew or Linuxbrew](#using-homebrew-or-linuxbrew)
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* [Using git](#using-git)
* [Using Linux package managers](#using-linux-package-managers)
* [Windows](#windows)
* [As Vim plugin](#as-vim-plugin)
* [Upgrading fzf](#upgrading-fzf)
* [Building fzf](#building-fzf)
* [Usage](#usage)
* [Using the finder](#using-the-finder)
* [Layout](#layout)
* [Search syntax](#search-syntax)
* [Environment variables](#environment-variables)
* [Options](#options)
* [Demo](#demo)
* [Examples](#examples)
* [fzf-tmux script](#fzf-tmux-script)
* [Key bindings for command line](#key-bindings-for-command-line)
* [Fuzzy completion for bash and zsh](#fuzzy-completion-for-bash-and-zsh)
* [Files and directories](#files-and-directories)
* [Process IDs](#process-ids)
* [Host names](#host-names)
* [Environment variables / Aliases](#environment-variables--aliases)
* [Settings](#settings)
* [Supported commands](#supported-commands)
* [Custom fuzzy completion](#custom-fuzzy-completion)
* [Vim plugin](#vim-plugin)
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* [Advanced topics](#advanced-topics)
* [Performance](#performance)
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* [Executing external programs](#executing-external-programs)
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* [Preview window](#preview-window)
* [Tips](#tips)
* [Respecting .gitignore](#respecting-gitignore)
* [Fish shell](#fish-shell)
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* [Related projects](#related-projects)
* [<a href="LICENSE">License</a>](#license)
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Installation
------------
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fzf project consists of the following components:
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- `fzf` executable
- `fzf-tmux` script for launching fzf in a tmux pane
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- Shell extensions
- Key bindings (`CTRL-T`, `CTRL-R`, and `ALT-C`) (bash, zsh, fish)
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- Fuzzy auto-completion (bash, zsh)
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- Vim/Neovim plugin
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You can [download fzf executable][bin] alone if you don't need the extra
stuff.
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[bin]: https://github.com/junegunn/fzf-bin/releases
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### Using Homebrew or Linuxbrew
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You can use [Homebrew](http://brew.sh/) or [Linuxbrew](http://linuxbrew.sh/)
to install fzf.
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```sh
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brew install fzf
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# To install useful key bindings and fuzzy completion:
$(brew --prefix)/opt/fzf/install
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```
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fzf is also available [via MacPorts][portfile]: `sudo port install fzf`
[portfile]: https://github.com/macports/macports-ports/blob/master/sysutils/fzf/Portfile
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### Using git
Alternatively, you can "git clone" this repository to any directory and run
[install](https://github.com/junegunn/fzf/blob/master/install) script.
```sh
git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
~/.fzf/install
```
### Using Linux package managers
| Package Manager | Linux Distribution | Command |
| --- | --- | --- |
| APK | Alpine Linux | `sudo apk add fzf` |
| APT | Debian 9+/Ubuntu 19.10+ | `sudo apt-get install fzf` |
| Conda | | `conda install -c conda-forge fzf` |
| DNF | Fedora | `sudo dnf install fzf` |
| Nix | NixOS, etc. | `nix-env -iA nixpkgs.fzf` |
| Pacman | Arch Linux | `sudo pacman -S fzf` |
| pkg | FreeBSD | `pkg install fzf` |
| pkg_add | OpenBSD | `pkg_add fzf` |
| XBPS | Void Linux | `sudo xbps-install -S fzf` |
| Zypper | openSUSE | `sudo zypper install fzf` |
Shell extensions (key bindings and fuzzy auto-completion) and Vim/Neovim
plugin may or may not be enabled by default depending on the package manager.
Refer to the package documentation for more information.
### Windows
Pre-built binaries for Windows can be downloaded [here][bin]. fzf is also
available via [Chocolatey][choco] and [Scoop][scoop]:
| Package manager | Command |
| --- | --- |
| Chocolatey | `choco install fzf` |
| Scoop | `scoop install fzf` |
[choco]: https://chocolatey.org/packages/fzf
[scoop]: https://github.com/ScoopInstaller/Main/blob/master/bucket/fzf.json
Known issues and limitations on Windows can be found on [the wiki
page][windows-wiki].
[windows-wiki]: https://github.com/junegunn/fzf/wiki/Windows
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### As Vim plugin
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If you use
[vim-plug](https://github.com/junegunn/vim-plug), add this line to your Vim
configuration file:
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```vim
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
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```
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`fzf#install()` makes sure that you have the latest binary, but it's optional,
so you can omit it if you use a plugin manager that doesn't support hooks.
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For more installation options, see [README-VIM.md](README-VIM.md).
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Upgrading fzf
-------------
fzf is being actively developed and you might want to upgrade it once in a
while. Please follow the instruction below depending on the installation
method used.
- git: `cd ~/.fzf && git pull && ./install`
- brew: `brew update; brew reinstall fzf`
- macports: `sudo port upgrade fzf`
- chocolatey: `choco upgrade fzf`
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- vim-plug: `:PlugUpdate fzf`
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Building fzf
------------
See [BUILD.md](BUILD.md).
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Usage
-----
fzf will launch interactive finder, read the list from STDIN, and write the
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selected item to STDOUT.
```sh
find * -type f | fzf > selected
```
Without STDIN pipe, fzf will use find command to fetch the list of
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files excluding hidden ones. (You can override the default command with
`FZF_DEFAULT_COMMAND`)
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```sh
vim $(fzf)
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```
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#### Using the finder
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- `CTRL-J` / `CTRL-K` (or `CTRL-N` / `CTRL-P`) to move cursor up and down
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- `Enter` key to select the item, `CTRL-C` / `CTRL-G` / `ESC` to exit
- On multi-select mode (`-m`), `TAB` and `Shift-TAB` to mark multiple items
- Emacs style key bindings
- Mouse: scroll, click, double-click; shift-click and shift-scroll on
multi-select mode
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#### Layout
fzf by default starts in fullscreen mode, but you can make it start below the
cursor with `--height` option.
```sh
vim $(fzf --height 40%)
```
Also check out `--reverse` and `--layout` options if you prefer
"top-down" layout instead of the default "bottom-up" layout.
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```sh
vim $(fzf --height 40% --reverse)
```
You can add these options to `$FZF_DEFAULT_OPTS` so that they're applied by
default. For example,
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```sh
export FZF_DEFAULT_OPTS='--height 40% --layout=reverse --border'
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```
#### Search syntax
Unless otherwise specified, fzf starts in "extended-search mode" where you can
type in multiple search terms delimited by spaces. e.g. `^music .mp3$ sbtrkt
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!fire`
| Token | Match type | Description |
| --------- | -------------------------- | ------------------------------------ |
| `sbtrkt` | fuzzy-match | Items that match `sbtrkt` |
| `'wild` | exact-match (quoted) | Items that include `wild` |
| `^music` | prefix-exact-match | Items that start with `music` |
| `.mp3$` | suffix-exact-match | Items that end with `.mp3` |
| `!fire` | inverse-exact-match | Items that do not include `fire` |
| `!^music` | inverse-prefix-exact-match | Items that do not start with `music` |
| `!.mp3$` | inverse-suffix-exact-match | Items that do not end with `.mp3` |
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If you don't prefer fuzzy matching and do not wish to "quote" every word,
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start fzf with `-e` or `--exact` option. Note that when `--exact` is set,
`'`-prefix "unquotes" the term.
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A single bar character term acts as an OR operator. For example, the following
query matches entries that start with `core` and end with either `go`, `rb`,
or `py`.
```
^core go$ | rb$ | py$
```
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#### Environment variables
- `FZF_DEFAULT_COMMAND`
- Default command to use when input is tty
- e.g. `export FZF_DEFAULT_COMMAND='fd --type f'`
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- `FZF_DEFAULT_OPTS`
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- Default options
- e.g. `export FZF_DEFAULT_OPTS="--layout=reverse --inline-info"`
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#### Options
See the man page (`man fzf`) for the full list of options.
#### Demo
If you learn by watching videos, check out this screencast by [@samoshkin](https://github.com/samoshkin) to explore `fzf` features.
<a title="fzf - command-line fuzzy finder" href="https://www.youtube.com/watch?v=qgG5Jhi_Els">
<img src="https://i.imgur.com/vtG8olE.png" width="640">
</a>
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Examples
--------
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Many useful examples can be found on [the wiki
page](https://github.com/junegunn/fzf/wiki/examples). Feel free to add your
own as well.
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`fzf-tmux` script
-----------------
[fzf-tmux](bin/fzf-tmux) is a bash script that opens fzf in a tmux pane.
```sh
# usage: fzf-tmux [LAYOUT OPTIONS] [--] [FZF OPTIONS]
# See available options
fzf-tmux --help
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# select git branches in horizontal split below (15 lines)
git branch | fzf-tmux -d 15
# select multiple words in vertical split on the left (20% of screen width)
cat /usr/share/dict/words | fzf-tmux -l 20% --multi --reverse
```
It will still work even when you're not on tmux, silently ignoring `-[pudlr]`
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options, so you can invariably use `fzf-tmux` in your scripts.
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Alternatively, you can use `--height HEIGHT[%]` option not to start fzf in
fullscreen mode.
```sh
fzf --height 40%
```
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Key bindings for command-line
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-----------------------------
The install script will setup the following key bindings for bash, zsh, and
fish.
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- `CTRL-T` - Paste the selected files and directories onto the command-line
- Set `FZF_CTRL_T_COMMAND` to override the default command
- Set `FZF_CTRL_T_OPTS` to pass additional options
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- `CTRL-R` - Paste the selected command from history onto the command-line
- If you want to see the commands in chronological order, press `CTRL-R`
again which toggles sorting by relevance
- Set `FZF_CTRL_R_OPTS` to pass additional options
- `ALT-C` - cd into the selected directory
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- Set `FZF_ALT_C_COMMAND` to override the default command
- Set `FZF_ALT_C_OPTS` to pass additional options
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If you're on a tmux session, you can start fzf in a tmux split pane or in
a tmux popup window by setting `FZF_TMUX_OPTS` (e.g. `-d 40%`).
See `fzf-tmux --help` for available options.
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More tips can be found on [the wiki page](https://github.com/junegunn/fzf/wiki/Configuring-shell-key-bindings).
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Fuzzy completion for bash and zsh
---------------------------------
#### Files and directories
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Fuzzy completion for files and directories can be triggered if the word before
the cursor ends with the trigger sequence which is by default `**`.
- `COMMAND [DIRECTORY/][FUZZY_PATTERN]**<TAB>`
```sh
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# Files under current directory
# - You can select multiple items with TAB key
vim **<TAB>
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# Files under parent directory
vim ../**<TAB>
# Files under parent directory that match `fzf`
vim ../fzf**<TAB>
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# Files under your home directory
vim ~/**<TAB>
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# Directories under current directory (single-selection)
cd **<TAB>
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# Directories under ~/github that match `fzf`
cd ~/github/fzf**<TAB>
```
#### Process IDs
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Fuzzy completion for PIDs is provided for kill command. In this case,
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there is no trigger sequence, just press tab key after kill command.
```sh
# Can select multiple processes with <TAB> or <Shift-TAB> keys
kill -9 <TAB>
```
#### Host names
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For ssh and telnet commands, fuzzy completion for host names is provided. The
names are extracted from /etc/hosts and ~/.ssh/config.
```sh
ssh **<TAB>
telnet **<TAB>
```
#### Environment variables / Aliases
```sh
unset **<TAB>
export **<TAB>
unalias **<TAB>
```
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#### Settings
```sh
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# Use ~~ as the trigger sequence instead of the default **
export FZF_COMPLETION_TRIGGER='~~'
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# Options to fzf command
export FZF_COMPLETION_OPTS='+c -x'
# Use fd (https://github.com/sharkdp/fd) instead of the default find
# command for listing path candidates.
# - The first argument to the function ($1) is the base path to start traversal
# - See the source code (completion.{bash,zsh}) for the details.
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_fzf_compgen_path() {
fd --hidden --follow --exclude ".git" . "$1"
}
# Use fd to generate the list for directory completion
_fzf_compgen_dir() {
fd --type d --hidden --follow --exclude ".git" . "$1"
}
# (EXPERIMENTAL) Advanced customization of fzf options via _fzf_comprun function
# - The first argument to the function is the name of the command.
# - You should make sure to pass the rest of the arguments to fzf.
_fzf_comprun() {
local command=$1
shift
case "$command" in
cd) fzf "$@" --preview 'tree -C {} | head -200' ;;
export|unset) fzf "$@" --preview "eval 'echo \$'{}" ;;
ssh) fzf "$@" --preview 'dig {}' ;;
*) fzf "$@" ;;
esac
}
```
#### Supported commands
On bash, fuzzy completion is enabled only for a predefined set of commands
(`complete | grep _fzf` to see the list). But you can enable it for other
commands as well by using `_fzf_setup_completion` helper function.
```sh
# usage: _fzf_setup_completion path|dir|var|alias|host COMMANDS...
_fzf_setup_completion path ag git kubectl
_fzf_setup_completion dir tree
```
#### Custom fuzzy completion
_**(Custom completion API is experimental and subject to change)**_
For a command named _"COMMAND"_, define `_fzf_complete_COMMAND` function using
`_fzf_complete` helper.
```sh
# Custom fuzzy completion for "doge" command
# e.g. doge **<TAB>
_fzf_complete_doge() {
_fzf_complete --multi --reverse --prompt="doge> " -- "$@" < <(
echo very
echo wow
echo such
echo doge
)
}
```
- The arguments before `--` are the options to fzf.
- After `--`, simply pass the original completion arguments unchanged (`"$@"`).
- Then write a set of commands that generates the completion candidates and
feed its output to the function using process substitution (`< <(...)`).
zsh will automatically pick up the function using the naming convention but in
bash you have to manually associate the function with the command using
`complete` command.
```sh
[ -n "$BASH" ] && complete -F _fzf_complete_doge -o default -o bashdefault doge
```
If you need to post-process the output from fzf, define
`_fzf_complete_COMMAND_post` as follows.
```sh
_fzf_complete_foo() {
_fzf_complete --multi --reverse --header-lines=3 -- "$@" < <(
ls -al
)
}
_fzf_complete_foo_post() {
awk '{print $NF}'
}
[ -n "$BASH" ] && complete -F _fzf_complete_foo -o default -o bashdefault foo
```
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Vim plugin
----------
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See [README-VIM.md](README-VIM.md).
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Advanced topics
---------------
### Performance
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fzf is fast and is [getting even faster][perf]. Performance should not be
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a problem in most use cases. However, you might want to be aware of the
options that affect the performance.
- `--ansi` tells fzf to extract and parse ANSI color codes in the input and it
makes the initial scanning slower. So it's not recommended that you add it
to your `$FZF_DEFAULT_OPTS`.
- `--nth` makes fzf slower as fzf has to tokenize each line.
- `--with-nth` makes fzf slower as fzf has to tokenize and reassemble each
line.
- If you absolutely need better performance, you can consider using
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`--algo=v1` (the default being `v2`) to make fzf use a faster greedy
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algorithm. However, this algorithm is not guaranteed to find the optimal
ordering of the matches and is not recommended.
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[perf]: https://junegunn.kr/images/fzf-0.17.0.png
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### Executing external programs
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You can set up key bindings for starting external processes without leaving
fzf (`execute`, `execute-silent`).
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```bash
# Press F1 to open the file with less without leaving fzf
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# Press CTRL-Y to copy the line to clipboard and aborts fzf (requires pbcopy)
fzf --bind 'f1:execute(less -f {}),ctrl-y:execute-silent(echo {} | pbcopy)+abort'
```
See *KEY BINDINGS* section of the man page for details.
### Preview window
When the `--preview` option is set, fzf automatically starts an external process
with the current line as the argument and shows the result in the split window.
Your `$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
The window can be scrolled using the mouse or custom key bindings.
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```bash
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# {} is replaced to the single-quoted string of the focused line
fzf --preview 'cat {}'
```
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Since the preview window is updated only after the process is complete, it's
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important that the command finishes quickly.
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```bash
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# Use head instead of cat so that the command doesn't take too long to finish
fzf --preview 'head -100 {}'
```
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Preview window supports ANSI colors, so you can use any program that
syntax-highlights the content of a file, such as
[Bat](https://github.com/sharkdp/bat) or
[Highlight](http://www.andre-simon.de/doku/highlight/en/highlight.php):
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```bash
fzf --preview 'bat --style=numbers --color=always --line-range :500 {}'
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```
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You can customize the size, position, and border of the preview window using
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`--preview-window` option, and the foreground and background color of it with
`--color` option. For example,
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```bash
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fzf --height 40% --layout reverse --info inline --border \
--preview 'file {}' --preview-window down:1:noborder \
--color 'fg:#bbccdd,fg+:#ddeeff,bg:#334455,preview-bg:#223344,border:#778899'
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```
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See the man page (`man fzf`) for the full list of options.
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For more advanced examples, see [Key bindings for git with fzf][fzf-git]
([code](https://gist.github.com/junegunn/8b572b8d4b5eddd8b85e5f4d40f17236)).
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[fzf-git]: https://junegunn.kr/2016/07/fzf-git/
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----
Since fzf is a general-purpose text filter rather than a file finder, **it is
not a good idea to add `--preview` option to your `$FZF_DEFAULT_OPTS`**.
```sh
# *********************
# ** DO NOT DO THIS! **
# *********************
export FZF_DEFAULT_OPTS='--preview "bat --style=numbers --color=always --line-range :500 {}"'
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# bat doesn't work with any input other than the list of files
ps -ef | fzf
seq 100 | fzf
history | fzf
```
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Tips
----
#### Respecting `.gitignore`
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You can use [fd](https://github.com/sharkdp/fd),
[ripgrep](https://github.com/BurntSushi/ripgrep), or [the silver
searcher](https://github.com/ggreer/the_silver_searcher) instead of the
default find command to traverse the file system while respecting
`.gitignore`.
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```sh
# Feed the output of fd into fzf
fd --type f | fzf
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# Setting fd as the default source for fzf
export FZF_DEFAULT_COMMAND='fd --type f'
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# Now fzf (w/o pipe) will use fd instead of find
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fzf
# To apply the command to CTRL-T as well
export FZF_CTRL_T_COMMAND="$FZF_DEFAULT_COMMAND"
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```
If you want the command to follow symbolic links, and don't want it to exclude
hidden files, use the following command:
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```sh
export FZF_DEFAULT_COMMAND='fd --type f --hidden --follow --exclude .git'
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```
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#### Fish shell
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`CTRL-T` key binding of fish, unlike those of bash and zsh, will use the last
token on the command-line as the root directory for the recursive search. For
instance, hitting `CTRL-T` at the end of the following command-line
```sh
ls /var/
```
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will list all files and directories under `/var/`.
When using a custom `FZF_CTRL_T_COMMAND`, use the unexpanded `$dir` variable to
make use of this feature. `$dir` defaults to `.` when the last token is not a
valid directory. Example:
```sh
set -g FZF_CTRL_T_COMMAND "command find -L \$dir -type f 2> /dev/null | sed '1d; s#^\./##'"
```
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Related projects
----------------
https://github.com/junegunn/fzf/wiki/Related-projects
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[License](LICENSE)
------------------
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The MIT License (MIT)
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Copyright (c) 2013-2020 Junegunn Choi