Support full `list` operations in `hosts` with no subcommand.

README.md

@@ -40,7 +40,7 @@ curl -L https://raw.github.com/alphabetum/hosts/master/hosts \
 
 ```text
 Usage:
-  hosts
+  hosts [<search string>]
   hosts add <ip> <hostname> [<comment>]
   hosts block <hostname>
   hosts disable (<ip> | <hostname> | <search string>)
@@ -81,6 +81,20 @@ hosts help <command name>
 
 ## Commands
 
+## `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 records will
+  be printed.
+
+  Alias for `hosts list`
+```
+
 ## `hosts add`
 
 ```text

hosts

@@ -373,7 +373,11 @@ _main() {
     # Pass all comment arguments to the program except for the first ($0).
     ${_CMD} "${_COMMAND_PARAMETERS[@]:-}"
   else
-    _die printf "Unknown command: %s\n" "${_CMD}"
+    local _parameters=()
+    _parameters+=("${_CMD}")
+    _parameters+=(${_COMMAND_PARAMETERS[@]:-})
+
+    "${DEFAULT_COMMAND}" "${_parameters[@]:-}"
   fi
 }
 
@@ -605,7 +609,7 @@ A program for managing host file entries.
 Version: ${_VERSION}
 
 Usage:
-  ${_ME}
+  ${_ME} [<search string>]
   ${_ME} add <ip> <hostname> [<comment>]
   ${_ME} block <hostname>
   ${_ME} disable (<ip> | <hostname> | <search string>)