I want to know the meaning of
help compgen I can get help page.
But it shows only the option lists. There is no explanation for it.
compgen: compgen [-abcdefgjksuv] [-o option] [-A action] [-G globpat] [-W wordlist] [-F function] [-C command] [-X filterpat] [-P prefix] [-S suffix] [word] Display possible completions depending on the options.
Intended to be used from within a shell function generating possible completions. If the optional WORD argument is supplied, matches against WORD are generated. Exit Status: Returns success unless an invalid option is supplied or an error occurs.
Especially I want know how
-abcdefgjksuv arguments works.