My approach is to copy, paste, & tailor the programmable completion for a command that has similar interface to my mine. Can try browsing /usr/local/share/bash

My approach is to copy, paste, & tailor the programmable completion for a command that has similar interface to my mine. Can try browsing /usr/local/share/bash-completions/completions or `set` & search for _FOO. Hopefully the special variables like COMPREPLY will be self-explanatory. Also `help compgen`. I'm assuming bash, by the way.