gpasswd: unrecognized option '--version' Usage: gpasswd [option] GROUP Options: -a, --add USER add USER to GROUP -d, --delete USER remove USER from GROUP -h, --help display this help message and exit -Q, --root CHROOT_DIR directory to chroot into -r, --remove-password remove the GROUP's password -R, --restrict restrict access to GROUP to its members -M, --members USER,... set the list of members of GROUP -A, --administrators ADMIN,... set the list of administrators for GROUP Except for the -A and -M options, the options cannot be combined.

Usage: gpasswd [option] GROUP Options: -a, --add USER add USER to GROUP -d, --delete USER remove USER from GROUP -h, --help display this help message and exit -Q, --root CHROOT_DIR directory to chroot into -r, --remove-password remove the GROUP's password -R, --restrict restrict access to GROUP to its members -M, --members USER,... set the list of members of GROUP -A, --administrators ADMIN,... set the list of administrators for GROUP Except for the -A and -M options, the options cannot be combined.