Don't want to waste prime keyboard real estate on a key you never use?
First, find out the keycode of your Caps Lock key: run xev, repeatedly press Caps Lock, note the keycode you see in the logs.
Next, create or append to the .Xmodmap file in your home directory:
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Where you replace 66 with whichever keycode you saw in the output of xev.
Finally, load the map: xmodmap .Xmodmap.
You can of course replace it with any other key as well, not just tab.
Tags: misc