guards --help (return code: 0)
/usr/bin/guards - select from a list of files guarded by conditions
SYNOPSIS: /usr/bin/guards [--prefix=dir] [--path=dir1:dir2:...]
[--default=0|1] [--check|--list] [--invert-match]
[--with-guards] [--config=file] symbol ...
(Default values: --path='', --default=1)