Linux User Group Management

Add User Group Command Groupadd

Syntax: Groupadd [-G GID] [-r] Group_name

-G: Specify user group ID

-r: Specify user group as System user group

Example:

[[email protected] ~]# groupadd testgrp[[email protected] ~]# grep testgrp/etc/group/etc/gshadow/etc/group:testgrp:x : 503:/etc/gshadow:testgrp:!::

change user group Parameters command Groupmod

Syntax: groupmod [-G GID] [-N group_new_name]group_old_name

-G: Change user group ID

-N: Change user group name

Example:

[[email protected] ~]# groupmod-g 504-ngroup1 testgrp[[email protected] ~]# grep group1/etc/group/etc/gshadow/etc/group : group1:x:504:/etc/gshadow:group1:!::

Delete User Group command Groupdel

Syntax: Groupdel [group_name]

Example:

[Email protected] ~]# Groupdel group1

Note: If this user group is the initial user group of a user, the user group cannot be deleted, but the user group can be deleted by changing the user's initial user group ID or by deleting the user.

[Email protected] ~]# Groupdel whxgroupdel:cannot Remove the primary groupof user ' whx '

User group Administrator function gpasswd

For root user actions:

Syntax: GPASSWD group_name

gpasswd [-A user_name1,...] [-M user_name2,...] Group_name

GPASSWD [-RR] Group_name

Set a password for a user group when no parameters are added

-A: Specify the administrative user for the user group

-M: adding user Group members

-r: Delete user group password

-R: Invalid user group password bar

For user group Administrator actions:

Syntax: gpasswd [-AD] user_name Group_name

-A: Add user group members

-D: Delete user Group members

Example:

[[email protected] ~]# groupadd testgrp[[email protected] ~]# gpasswd  Testgrpchanging the password for group testgrpnew password:re-enter new  password:[[email protected] ~]# gpasswd -A xx testgrp[[email  Protected] ~]# grep testgrp /etc/group/etc/gshadow/etc/group:testgrp:x:503:/etc/gshadow: testgrp:$1$mxatf/sr$nudqk9ytidegnk0qkjybh0:xx:[[email protected] ~]# su xx[[email  protected] root]$ cd ~[[email protected] ~]$ iduid=501 (XX)  gid=501 (XX) groups=501 (XX), (WHX) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023[[email protected]  ~]$ gpasswd -a xx testgrpadding user xx to group testgrp[[ email protected] ~]$ gpasswd -a whx tesetgrpgpasswd: group  ' Tesetgrp '  does not exist in/etc/group[[email protected] ~]$ gpasswd -a whx testgrpadding user  whx to group testgrp[[email protected] ~]$ grep testgrp /etc/ Grouptestgrp:x:503:xx,whx

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Linux User Group Management