Xbindkeys is a program that allows to bind commands to certain keys or key combinations on the keyboard. Xbindkeys works with multimedia keys and is window manager / DE independent, so if you switch much, xbindkeys is very handy.
For those who prefer a GUI, there is the AUR.AUR package in the
Create a file named
.xbindkeysrc in your home directory:
$ touch ~/.xbindkeysrc
Alternatively, you can create a sample file (Note this includes some bindings such as
Ctrl+f, which you may want to edit or remove):
$ xbindkeys -d > ~/.xbindkeysrc
Now you can either edit
~/.xbindkeysrc to set keybindings, or you can do that with the GUI.
The first line represents a command. The second contains the state (0x8) and keycode (32) as reported by
xev. The third line contains the keysyms associated with the given keycodes. To use this output, copy either one of the last two lines to
~/.xbindkeysrc and replace "(Scheme function)" with the command you wish to perform. Here is an example configuration file that binds Fn key combos on a laptop to commands that adjust sound volume. Note that pound (#) symbols can be used to create comments.
# Increase volume "pamixer --increase 5" XF86AudioRaiseVolume
# Decrease volume "pamixer --decrease 5" m:0x0 + c:122
"pamixer --decrease 5" XF86AudioLowerVolume
Alternatively, instead of PulseAudio and to change volume level (replace above pamixer command with the following):it is also possible to use pactl to control a running
pactl set-sink-volume 0 +2% pactl set-sink-volume 0 -2% pactl set-sink-mute 0 toggle
Instead of setting forcefully sink number it is possible to use
pactl set-sink-volume @DEFAULT_SINK@ +2% pactl set-sink-volume @DEFAULT_SINK@ -2% pactl set-sink-mute @DEFAULT_SINK@ toggle
Another possibility is to use amixer (part of thepackage)
amixer -c 1 set Master 5+ amixer -c 1 set Master 5- amixer -c 1 set Master toggle
xbindkeys -pto reload the configuration file and apply the changes.
To find the keycodes for a particular key, enter the following command:
$ xbindkeys -k
A blank window will pop up. Press the key(s) to which you wish to assign a command and xbindkeys will output a handy snippet that can be entered into
~/.xbindkeysrc. For example, while the blank window is open, press
Alt+o to get the following output (results may vary):
"(Scheme function)" m:0x8 + c:32 Alt + o
xbindkeys -mkto keep the key prompt open for multiple keypresses. Press
Making changes permanent
before the line that starts your window manager or DE.
Simulating multimedia keys
The XF86Audio* and other multimedia keys  are pretty-much well-recognized by the major DEs. For keyboards without such keys, you can simulate their effect with other keys
# Decrease volume on pressing Super-minus "amixer set Master playback 1-" m:0x50 + c:20 Mod2+Mod4 + minus
However, to actually call the keys themselves you can use tools like official repositories) and AUR (from the AUR). Unfortunately since you'd already be holding down some modifier key (Super or Shift, for example), X will see the result as
Super-XF86AudioLowerVolume which won't do anything useful. Here's a script based on xmacro and xmodmap from the package for doing this.
#!/bin/sh echo 'KeyStrRelease Super_L KeyStrRelease minus'
This works for calling XF86AudioLowerVolume once (assuming you are using
Super+minus), but repeatedly calling it without releasing the Super key (like tapping on a volume button) does not work. If you would like it to work that way, add the following line to the bottom of the script.
echo 'KeyStrPress Super_L' | xmacroplay :0
With this modified script, if you press the key combination fast enough your Super_L key will remain 'on' till the next time you hit it, which may result in some interesting side-effects. Just tap it again to remove that state, or use the original script if you want things to 'just work' and do not mind not multi-tapping on volume up/down.
These instructions are valid for pretty much any one of the XF86 multimedia keys (important ones would be XF86AudioRaiseVolume, XF86AudioLowerVolume, XF86AudioPlay, XF86AudioPrev, XF86AudioNext).
If, for any reason, a hotkey you already set in
~/.xbindkeysrc doesn't work, open up a terminal and type the following:
$ xbindkeys -n
By pressing the non-working key, you will be able to see any error xbindkeys encounter (e.g: mistyped command/keycode,...).