GPASSWD linux command manual

GPASSWD(1)                                                         GPASSWD(1)

       gpasswd - administer the /etc/group file

       gpasswd group
       gpasswd -a user group
       gpasswd -d user group
       gpasswd -R group
       gpasswd -r group
       gpasswd [-A user,...] [-M user,...] group

       gpasswd  is  used  to administer the /etc/group file (and /etc/gshadow
       file if compiled with SHADOWGRP defined). Every group can have  admin-
       istrators,  members  and  a  password. System administrator can use -A
       option to define group administrator(s) and -M option to  define  mem-
       bers and has all rights of group administrators and members.

       Group  administrator  can add and delete users using -a and -d options
       respectively. Administrators can use -r option to remove  group  pass-
       word.  When no password is set only group members can use newgrp(1) to
       join the group. Option -R disables access to the  group  through  new-
       grp(1) command.

       gpasswd  called  by a group administrator with group name only prompts
       for the group password. If password is set the members can still  new-
       grp(1) without a password, non-members must supply the password.

       /etc/group - group information
       /etc/gshadow - shadow group information

       newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8)

       Rafal Maszkowski