Provided by:
passwd_4.0.18.2-1ubuntu2_i386 
NAZWA
gpasswd - administer the /etc/group file
SKŁADNIA
gpasswd [option] group
OPIS
The gpasswd command 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 the -A option to define group administrator(s) and the -M option to
define members and has all rights of group administrators and members.
gpasswd called by a group administrator with a group name only prompts
for the group password. If a password is set the members can still
newgrp(1) without a password, and non-members must supply the password.
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.
OPCJE
Except for the -A and -M options, the options cannot be combined. The
options which apply to the gpasswd command are:
-a user
Add the user to the named group.
-d user
Remove the user from the named group.
-r
Remove the password from the named group. Only group members will
be allowed to use newgrp to join the named group.
-R
Restrict the access to the named group. Only group members will be
allowed to use newgrp to join the named group.
-A user,...
Set the list of administrative users.
-M user,...
Set the list of group members.
PLIKI
/etc/group
Informacje o grupach użytkowników.
/etc/gshadow
Informacje chronione o grupach użytkowników.
ZOBACZ TAKŻE
newgrp(1), gshadow(5), groupadd(8), groupdel(8), groupmod(8), grpck(8),
group(5).