Linux Group Commands Decoded: groupadd, groupmod, gpasswd

Topics covered in this videos:
Creating a Group with default options
Creating a group with user specified group id (GID)
Modifying the properties of the group
Changing the GID of the group
Changing the name of the group
Adding and Removing Members to a Group
To add single user to the group
Adding multiple single or multiple users to the group with various attributes
Adding a single user using gpasswd
Making a user as a administrator
Removing a user from the group
To add and remove groups use can also use the graphical tool in linux

USER AND GROUP ADMINISTRATION (PART- II GROUP ADMINISTRATION):

GROUPS:
• Users are assigned to groups with unique group ID numbers (the GID)
• The group name and GID are stored in /etc/group
• Each user is given their own private group
• They can also be added to their groups to gain additional access
• All users in a group can share files that belong to the group

Each user is a member of at least one group, called a primary group. In addition, a user can be a
member of an unlimited number of secondary groups. Group membership can be used to
control the files that a user can read and edit. For example, if two users are working on the
same project you might put them in the same group so they can edit a particular file that other
users can access.

• A user’s primary group is defined in the /etc/passwd file and Secondary groups are defined in the /etc/group file.

• The primary group is important because files created by this user will inherit that group affiliation.

Creating a Group with default options :
• To create a group the syntax is
#groupadd name for the group
#groupadd ktgroup

Creating a group with user specified group id (GID):
#groupadd option name for the group
#groupadd -g 595 ktgroup
• Verify it in /etc/group

Modifying the properties of the group:
• To modify the group properties the syntax is
#groupmod option arguments group name

Options:
• -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 600 ktgroup
• Verify it in /etc/group

Changing the name of the group:
• The syntax for changing the group name is
#groupmod –n new name existing name
#groupmod –n kernelgrp ktgroup

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 ktgroup ktuser

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 ktuser2,ktuser3,ktuser4 ktgroup

Adding a single user using gpasswd
#gpasswd –a ktuser ktgroup (verify it in /etc/group)

Making a user as a administrator
#gpasswd –A ktuser ktgroup (verify it in /etc/gshadow)

Removing a user from the group
#gpasswd –d ktuser2 ktgroup

To add and remove groups use can also use the graphical tool in linux
#system-config-users &

#GroupCreation
#GroupModification
#UserGroupManagement
#AdminDesignation
#LinuxGroupTools
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