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gpasswd - Unix, Linux Command
NAME
gpasswd - administer the /etc/group file
SYNOPSIS
Tag | Description |
gpasswd group
gpasswd -a user group
gpasswd -d user group
gpasswd -R group
gpasswd -r group
gpasswd [-A user,...] [-M user,...] group
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DESCRIPTION
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.
OPTIONS
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 this group).
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.
FILES
Tag | Description |
/etc/group
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Group account information.
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/etc/gshadow
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Secure group account information.
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SEE ALSO
newgrp(1),
gshadow(5),
groupadd(8),
groupdel(8),
groupmod(8),
grpck(8),
group(5).
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