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GROUP ADMINISTRATION

According UPG (user private group) scheme, the user account automatically created own group with the
same name. A part from the UPG scheme we can create the groups.

Group:
A collection of users called group. The group can be running with GID value. This group information
available at “/etc/group” database file.
In the group administration 2 types groups are available

1. PRIMARY GROUP
2. SECONDARY GROUP

1. PRIMARY GROUP
Which user initially belongs to the particular group, the group is the primary group to the user (primary
user). This user can access or share the information according group permissions.

2. SECONDARY GROUP
A part from the primary group, the user has account in another group, the group called Secondary Group.

Note: - The user has only one primary group remaining all groups are the secondary groups.

In Group Administration effectively use the 4 Commands are
1. groupadd
2. groupmod
3. gpasswd
4. groupdel

groupadd: - To create a new group
1. Adding a new group
[root@sun ~] # groupadd <group name>
[root@sun ~] # groupadd g1

2. Adding a new group with gid 5000
[root@sun ~]# groupadd <options> <group name>
[root@sun ~]# groupadd -g 5000 g2

3. To see the existence group detail
[root@sun ~]# grep g2 /etc/group

groupmod- we can modify the values of existence groups.

4. modify the group with gid value
[root@sun ~]# groupmod -g 6000 g2
[root@sun ~]# grep g2 /etc/group

5. Change the name of a existing group
[root@sun ~]# groupmod -n <new name> <old name>
[root@sun ~]# groupmod -n g3 g2
[root@sun ~]# grep g3 /etc/group

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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