Linux: Keyboard Software Guide

By Xah Lee. Date: . Last updated: .

This page is a overview of how to create keyboard shortcuts, how to remap/swap keys, how to change keyboard layout.

In Linux, there are 2 steps to create keyboard shortcuts:

  1. Action: A shell command that does something, for example, switch/close window, simulate key press, mouse click, launch app, open file, empty trash.
  2. Bind Key: Make a key press run a shell command/script.

First, let's look at the easy way.

Basic of Keybinding Using Control Panel

The most easy way to add a new keyboard shortcut or keyboard layout, is the system control panel in a graphical user interface (available in any of the Gnome, KDE, Ubuntu, Xfce, LXDE). Under the system control panel (aka Setting Manager or System Preference), usually there are apps named Window Manager, or Keyboard, or Keyboard Layout.

xfce window manager keys setup 2013-06-07
xfce window manager keys setup

The window manager typically lets you set keys related to manipulating windows, system-wide, such as switching windows, close window, max/min window, move window, show/hide/iconify window, switch workspace (aka virtual screen), etc.

xfce keyboard setting panel 2013-06-01
xfce keyboard setting panel

The keyboard setting tool typically lets you set a key to launch app, or run a shell script. But it does not lets you swap keys, or set a key to send key combo such as 【Ctrl+s】

Swapping Keys, Remap Keys

xmodmap

xmodmap is a simple tool that lets you remap/swap keys for apps running under X11.

[see Linux: xmodmap Tutorial]

scancode, keycode, keysym

To work with keys in Linux X11, you must understand {scancode, keycode, keysym} because many key tools use their concept and syntax.

How to find the scancode of a key?

[see Linux: Find Keyboard Key Scancode]

How to find the keycode / keysym of a key?

[see Linux: X11 Keyboard Key Names]

How to set system keyboard layout?

keybinding in linux can be divided into 2 layers: the X11 window system layer, or system level.

Many keybinding setup works in X11 layer only. i.e. when in Virtual Console or single user mode console or system startup console, your custome key setting won't kick in.

The letter layout, is usually in the system layer. (but it can also be X11 layer only too.)

[see Linux: Set System Keyboard Layout]

Tool to Bind Key

xbindkeys

if your desktop doesn't provide a way to bind a key to launch a script, then you can use xbindkeys.

[see Linux: xbindkeys Tutorial]

Tool for Key Actions

「wmctrl」 for Switch Windows

wmctrl is a command line tool to {switch, close, move, resize, set title, list, …} windows.

[see Linux: Add Keyboard Shortcut to Switch App]

「xvkbd」 for Sending Keychords

xvkbd is a virtual keyboard for X window system. It is useful as a shell command to send keys.

Linux: xvkbd tutorial

Linux: Control Sound Level by Command Line

Linux: Change Volume by Command

xdotool

xdotool. «programatically simulate keyboard input and mouse activity. It does this using X11's XTEST extension and other Xlib functions.»

(note: i tried xdotool under Ubuntu/xfce. Doesn't work in my first 30 min of looking into it.)

#Install xdotool
 sudo apt-get install xdotool

Example. Send 【Ctrl+w】 to close tab.

xdotool key --delay 40 Control_L+w

Example. Click on upper left corner, (90, 10) pixels.

xdotool mousemove 90 10 click 1

「autokey」 for Expanding Abbreviations

AutoKey. For expanding abbrev to full words/text.

Install: sudo apt-get install autokey-gtk (for Gnome) or sudo apt-get install autokey-qt (for KDE)

(note: i haven't used AutoKey, and the project seems dead as of 2017-06-06.)

Other Keyboard Tools

Mouse Extra Button Tools

How to set 5 buttons mouse?

apt-get install imwheel for config mouse buttons.

Emacs

See: Emacs Keybinding, Keyboard, Articles Index.

Space Bar as Dual Key

Linux utility to configure modifier keys to act as other keys when pressed and released on their own. https://github.com/alols/xcape

Linux Keybinding How-to

  1. Keyboard Software Guide
  2. Swap Control Alt Keys
  3. Set F2 F3 F4 to Cut Copy Paste
  4. CapsLock → Escape
  5. CapsLock → Home
  6. Shift Lock
  7. Key to Switch App
  8. Key Repeat Rate
  9. System Keyboard Layout
  10. Switch Keyboard Layout
  11. Change Volume
  12. xmodmap
  13. xbindkeys
  14. xvkbd
  15. Find Keyboard Key Scancode
  16. X11 Keyboard Key Names
  17. 2 Layouts for 2 Keyboards
  18. Chinese Input Setup

Mouse

  1. Mouse Hover to Auto-Raise Window
  2. Mouse Hover-Click
  3. Set Mouse Single-Click to Open File
  4. How to Set Mouse Speed
  5. How to Swap Mouse Buttons
  6. Set Trackball/Mouse Do Scroll
  7. Setup Accelerated Scroll and AutoScroll
  8. X11 Mouse Button Numbering

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