\section bind bind - handle fish key bindings

\subsection bind-synopsis Synopsis
<tt>bind [OPTIONS] SEQUENCE COMMAND</tt>

\subsection bind-description Description

<tt>bind</tt> adds a binding for the specified key sequence to the
specified command.

SEQUENCE is the character sequence to bind to. These should be written as
<a href="index.html#escapes">fish escape sequences</a>. For example, because pressing
the Alt key and another character sends that character prefixed with
an escape character, Alt-based key bindings can be written using the
\c \\e escape. For example, Alt-w can be written as
<tt>\\ew</tt>. The control character can be written in much the same way
using the \c \\c escape, for example Control-x (^X) can be written as
<tt>\\cx</tt>. Note that Alt-based key bindings are case sensitive and
Control-based key bindings are not. This is a constraint of text-based
termainls, not \c fish.

The default key binding can be set by specifying a SEQUENCE of the empty
string (that is, <code>''</code>). It will be used whenever no
other binding matches. For most key bindings, it makes sense to use
the \c self-insert function (i.e. <tt>bind '' self-insert</tt> as the
default keybinding. This will insert any keystrokes not specifically
bound to into the editor. Non-printable characters are ignored by the
editor, so this will not result in control sequences being
printable.

If the -k switch is used, the name of the key (such as down, up or
backspace) is used instead of a sequence. The names used are the same
as the corresponding curses variables, but without the 'key_'
prefix. (See \c terminfo(5) for more information, or use <tt>bind
--key-names</tt> for a list of all available named keys.)

COMMAND can be any fish command, but it can also be one of a set of
special input functions. These include functions for moving the
cursor, operating on the kill-ring, performing tab completion,
etc. Use 'bind --function-names' for a complete list of these input
functions.

When COMMAND is a shellscript command, it is a good practice to put
the actual code into a <a href="#function">function</a> and simply
bind to the function name. This way it becomes significantly easier to
test the function while editing, and the result is usually more
readable as well.

Key bindings are not saved between sessions by default. To save custom
keybindings, edit the \c fish_user_key_bindings function and insert the
appropirate \c bind statements.

The following parameters are available:

- <tt>-k</tt> or <tt>--key</tt> Specify a key name, such as 'left' or 'backspace' instead of a character sequence
- <tt>-K</tt> or <tt>--key-names</tt> Display a list of available key names
- <tt>-f</tt> or <tt>--function-names</tt> Display a list of available input functions

\subsection bind-example Examples

<tt>bind \\cd 'exit'</tt> causes \c fish to exit when Control-d is pressed.

<tt>bind -k ppage history-search-backward</tt> performs a history search when the Page Up key is pressed.

