sss_groupmod 8 sss_groupmod modify a group sss_groupmod options GROUP sss_groupmod modifies the group to reflect the changes that are specified on the command line. -a,--append-group GROUPS Append this group to groups specified by the GROUPS parameter. The GROUPS parameter is a comma separated list of group names. -r,--remove-group GROUPS Remove this group from groups specified by the GROUPS parameter.