mount.crypt -V (return code: 1)
mount.crypt: You need to specify the mountpoint
mount.crypt --help (return code: 0)
Usage: mount.crypt [-nrv] [-o ARG] [-?|--help] [--usage]
-n Do not update /etc/mtab
-o ARG Mount options
-r Set up devices and mounts as read-only
-v Enable debugging
-?, --help Show this help message
--usage Display brief usage message