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I need to provision several Ubuntu 14.04/14.10 desktops. Most things I've been able to provision easily because they can be set in config files or from the command line.

But I'm having trouble with 2 things, setting the available languages and setting the keyboard shortcuts for switching between the languages. I know how to do them from gnome-control-center

  1. Set the available languages

    Region & Language > Input Sources > English (US) + German + Italian

  2. Set the keyboard shortcuts for switching languages

    Shortcut Settings > Typing > Switch to next source (Super+Escape), Switch to previous source (Shift+Super+Escape)

But I don't know how to do from config files or command line, so I can't provision it automatically.

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The keys

The keys you are looking for are:

  1. for editing the input sources:

    org.gnome.desktop.input-sources sources
    
  2. for editing the keyboard shortcut for switching languages forward:

    org.gnome.desktop.wm.keybindings switch-input-source
    
  3. for switching input source backward:

    org.gnome.desktop.wm.keybindings switch-input-source-backward
    

The commands to edit the settings

Example commands to edit the three from command line:

  1. For editing the input sources, to set the input sources as mentioned in your question:

    gsettings set org.gnome.desktop.input-sources sources "[('xkb', 'us'), ('xkb', 'it'), ('xkb', 'de')]"
    
  2. to set the switch- shortcut key combination to Ctrl+space

    gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Primary>space']"
    
  3. to set the switch- shortcut key combination to switch backward Shift+Super+space

    gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward "['<Shift><Super>space']"
    

The commands to get the current settings

gsettings get org.gnome.desktop.input-sources sources
gsettings get org.gnome.desktop.wm.keybindings switch-input-source
gsettings get org.gnome.desktop.wm.keybindings switch-input-source-backward

How to find these keys

You can search for keywords in the database by listing all keys with the command:

gsettings list-recursively

which will list all existing keys, or (which I regularly do) install dconf-editor and simply find your keyword(s) with Ctrl+F.


Edit

As requested in a comment, I added a small script to walk through the input sources from command line:

#!/usr/bin/env python3
import subprocess
import sys

src = sys.argv[1]
key = "org.gnome.desktop.input-sources"
get = lambda cmd: subprocess.check_output(["/bin/bash", "-c", cmd]).decode("utf-8").strip()

src_list = len(eval(get("gsettings get "+key+" sources")))-1
current = int(get("gsettings get "+key+" current").split()[-1])
if src == "+":
    set_new_value = "gsettings set "+key+" current "+(str(current+1) if current <  src_list else "0")
elif src == "-":
    set_new_value = "gsettings set "+key+" current "+(str(current-1) if current > 0 else str(src_list))
subprocess.Popen(["/bin/bash","-c", set_new_value])

To run it

  1. Save the script, into an empty file, as switch_source.py
  2. Run it by the command:

    python3 /path/to/switch_source.py +
    

    to go to the next input source, and

    python3 /path/to/switch_source.py -
    

    to go to the previous one

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  • I will test this out and report back. 'switch-input-source' would be for 'Switch to next source', how can I find the key for 'Switch to previous source'? – user779159 Apr 2 '15 at 15:35
  • How did you find these keys btw, is there a simple way to tell which keys correspond to which settings in gnome-control-center? Like is it documented somewhere or is there a technical way to find out? – user779159 Apr 2 '15 at 15:35
  • @user779159 edited my posts with answers to both comments :) – Jacob Vlijm Apr 2 '15 at 16:03
  • Setting the sources works great, thanks! But switching isn't working. From the command line doing setxkbmap de works fine, but not with keyboard shortcuts, nothing happens. Looking through the settings I see org.gnome.settings-daemon.peripherals.keyboard input-sources-switcher 'off', could it be related? – user779159 Apr 2 '15 at 20:03
  • 1
    @Fabby I just need an excuse to pythonize something now and then :). – Jacob Vlijm Apr 6 '15 at 18:36

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