If you speak German but prefer using an English keyboard layout for programming (dvorak in my case), then you will frequently face the issue of how to conveniently enter Umlaute.
Luckily, there's an easy solution with xmodmap, just add the below to your .Xmodamp config:
clear mod1
keycode 108 = Mode_switch
add mod1 = Alt_L
keysym a = a A adiaeresis Adiaeresis
keysym o = o O odiaeresis Odiaeresis
keysym u = u U udiaeresis Udiaeresis
keysym s = s S ssharp
Where 108 is the keycode returned by xev for your Alt key.
Tags: misc