xmodmap --help

usage: xmodmap [-options ...] [filename]

where options include:

-display host:dpy X server to use

-verbose, -quiet turn logging on or off

-n don't execute changes, just show like make

-e expression execute string

-pm print modifier map

-pk print keymap table

-pke print keymap table as expressions

-pp print pointer map

-grammar print out short help on allowable input

- read standard input