A colleguea of mine noticed me struggling with testing unicode support for the current application. I actually never knew a decent way to enter all those pesky (ë ę ç è ñ) characters.
The following xmodmap line will bind the right alt key (commonly known as alt-gr) to the multi (or ‘compose’) key:
xmodmap -e ‘keysym Alt_R = Multi_key’
after this you can use the right alt key followed by the accent you want to use and the character you want to use it for CøøL!
(The xmodmap program is used to edit and display the keyboard modifier map and keymap table that are used by client applications to convert event keycodes into keysyms. It is usually run from the user’s session startup script to configure the keyboard according to personal tastes.)