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Write Output
This command writes an xmodmap input file representing the current
state of the keyboard (including all of your changes) to a file in
your home directory. Note that this command DOES NOT write out the
default keymap for this keyboard type unless you have clicked on
Restore Default Map before.
The file will be called .xmodmap-hostname, where hostname is the
name of the machine you’re running on. It will warn you if the
file already exists.
It prompts you with a dialog box: you can either write an xmodmap
file representing the state of every key, or you can write a
smaller file which describes only the changes.
The idea is that in the appropriate startup script, you would add a
line like xmodmap /.xmodmap-`uname -n`Uit
http://manpages.ubuntu.com/manpages/gutsy/man1/xkeycaps.1.html