GPASSWD(1) User Commands GPASSWD(1)
gpasswd - administer the /etc/group file
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
administrators, members and a password. System administrator can use -A
option to define group administrator(s) and -M option to define members
and has all rights of group administrators and members.
Notes about group passwords
Group passwords are an inherent security problem since more than one
person is permitted to know the password. However, groups are a useful
tool for permitting co-operation between different users.
Group administrator can add and delete users using -a and -d options
respectively. Administrators can use -r option to remove group
password. When no password is set only group members can use newgrp to
join the group. Option -R disables access via a password to the group
through newgrp command (however members will still be able to switch to
gpasswd called by a group administrator with group name only prompts
for the group password. If password is set the members can still
newgrp(1) without a password, non-members must supply the password.
Group account information.
Secure group account information.
newgrp(1), gshadow(5), groupadd(8), groupdel(8), groupmod(8), grpck(8),
User Commands 02/25/2007 GPASSWD(1)