Creating a Group with default options :
- To create a group the syntax is
- #groupadd <name for the group>
- #groupadd admingrp
Let see admingrp group created and that group id is 1012.
Creating a group with user specified group id (GID)
- #groupadd <option> <name for the group>
- #groupadd -g 615 admin
- Verify it in /etc/group
Modifying the properties of the group :
- To modify the group properties the syntax is
- #groupmod <option> <arguments> <group name>
- -g to change the group id
- -o to override the previous assigned id, if it matches with the new one.
- -n to change the group name
- Changing the GID of the group
- #groupmod –g 700 admin
- Verify it in /etc/group
Let see the groupid is changed.
Changing the name of the group:
- The syntax for changing the group name is
- #groupmod –n <new name > < existing name >
- #groupmod –n newadmin admin
Adding and Removing Members to a Group :
- Adding the members to the group is to add users to the group. To add the members to the group the syntaxes are
- To add single user to the group
- #usermod –G <group name > < user name>
- #usermod –G newadmin toplearnlinux
Adding multiple single or multiple users to the group with various attributes
- #gpasswd < option> <arguments> <group name>
Options:
- -M For Adding Multiple users to a group
- -A for Adding a group Administrator
- -a for Adding a single user to a group
- -d removing a user from a group
- #gpasswd –M <user>,<user>,<user> <group>
- #gpasswd –M admin2,admin3,admin4 newadmin
Adding a single user using gpasswd :
- #gpasswd –a admintl newadmin
Making a user as a administrator:
- #gpasswd –A admintl newadmin
Removing a user from the group :
- #gpasswd –d admin2 newadmin
