complete -c xrdb -o display          -d 'display to use'
complete -c xrdb -o all              -d 'do all resources [default]'
complete -c xrdb -o global           -d 'do screen-independent resources'
complete -c xrdb -o screen           -d 'do screen-specific resources for one screen'
complete -c xrdb -o screens          -d 'do screen-specific resources for all screens'
complete -c xrdb -o n                -d 'show but don\'t do changes'
complete -c xrdb -o cpp -r           -d 'preprocessor to use [/usr/bin/mcpp]'
complete -c xrdb -o nocpp            -d 'do not use a preprocessor'
complete -c xrdb -o query            -d 'query resources'
complete -c xrdb -o load             -d 'load resources from file [default]'
complete -c xrdb -o override         -d 'add in resources from file'
complete -c xrdb -o merge            -d 'merge resources from file & sort'
complete -c xrdb -o edit -r          -d 'edit resources into file'
complete -c xrdb -o backup -x        -d 'backup suffix for -edit [.bak]'
complete -c xrdb -o symbols          -d 'show preprocessor symbols'
complete -c xrdb -o remove           -d 'remove resources'
complete -c xrdb -o retain           -d 'avoid server reset (avoid using this)'
complete -c xrdb -o quiet            -d 'don\'t warn about duplicates'
#complete -c xrdb -s Dname[=value],
#complete -c xrdb -s Uname,
#complete -c xrdb -s Idirectory  -d 'passed to preprocessor'