Best Group Management (Groupadd, Groupdel, Groupmod, Gpasswd) Commands In Linux

In this article, we are going to learn the Group Management command in Linux. We have Four useful commands in Linux to Manage Groups i.e. groupaddgroupdelgroupmodgpasswd. Managing Groups means we have to perform tasks such as Create Group, Delete Group, Modify Created Group, Add User into a Group, Delete User from a Group, and so on. The main database file of the group is /etc/group and it takes default settings like GID information from /etc/login.defs.

The Linux Commands for Group Management are :

  1. groupadd : Linux groupadd command is used to create a new group.
  2. groupdel : Used to delete a Group
  3. groupmod : Used to Modify an already created group.
  4. gpasswd : Used to Perform administrative tasks such as Add user into a group, Remove User from a Group, etc.
Best Group Management (Groupadd, Groupdel, Groupmod, Gpasswd) Commands In Linux

Best Group Management (Groupadd, Groupdel, Groupmod, Gpasswd) Commands In Linux

Follow the below Group Management Commands:

Create a New Group using Linux groupadd command

Let’s start with our first group management command i.e. groupadd.

To create a new group we can use Linux groupadd command. Here I am creating a group developer.

[root@localhost ~]# groupadd developers   # Create a New Group

[root@localhost ~]# cat /etc/group | grep developers   # Confirm the Setting
developers:x:501:

Delete a Group

To delete a group we can use groupdel command. Here I am deleting the group developers.

[root@localhost ~]# groupdel developers   # Delete a Group

Create a Group with your own GID (Group ID)

You can assign a GID (Group ID) of your own choice or as per your scenario. To do so you can use groupadd command with argument -g. Here I am creating a group with GID 555.

[root@localhost ~]# groupadd -g 555 admins   # Assign a GID to a New Group
[root@localhost ~]# cat /etc/group | grep admins
admins:x:555:

Create a System Group

To create a System Group use Linux groupadd command with argument -r.

Now you might be thinking that what is the difference between a normal group and a system group. The only difference is GID of the normal group starts from 500 and above and the System groups from 1 to 499.

As you can see below the GID of our system group is 493 which is below 500.

[root@localhost ~]# groupadd -r workers   # Create a System Group
[root@localhost ~]# cat /etc/group | grep workers
workers:x:493:

Create a Group with Duplicate GID (Group ID)

We can create multiple Groups with the same GID Number. to do so use groupadd command with argument -o. Here I have created some groups of i.e developers (GID – 501), admins (GID – 555), workers (GID – 493). Now I am going to create a new group by using the GID of admins. As you can see below the GID of group admins is 555.

[root@localhost ~]# tail -n 3 /etc/group
developers:x:501:
admins:x:555:
workers:x:493:

So to create a group with duplicate GID refer to the below command.

[root@localhost ~]# groupadd -o -g 555 engineers   # Create a Group with duplicate GID

# Confirm the Changes

[root@localhost ~]# cat /etc/group | grep 555
admins:x:555:
engineers:x:555:

For more help on groupadd command, you can refer to the below command.

[root@localhost ~]# groupadd --help   # For more help on groupadd command
Usage: groupadd [options] GROUP

Options:
  -f, --force                   exit successfully if the group already exists,
                                and cancel -g if the GID is already used
  -g, --gid GID                 use GID for the new group
  -h, --help                    display this help message and exit
  -K, --key KEY=VALUE           override /etc/login.defs defaults
  -o, --non-unique              allow to create groups with duplicate
                                (non-unique) GID
  -p, --password PASSWORD       use this encrypted password for the new group
  -r, --system                  create a system account

Rename a Group

After Linux groupadd command our next group management command is groupmod.

To rename a group you can use groupmod command with argument -n. Here I a have group named admins with GID 493 and I am renaming the group from admins to workers but the GID will be the same.

[root@localhost ~]# cat /etc/group | grep admins
admins:x:493:

So to Rename a group refers to the below command.

Syntax : groupmod -n [new name] [old name]

[root@localhost ~]# groupmod -n workers admins   # Rename a Group
[root@localhost ~]# cat /etc/group | grep workers
workers:x:493:

Assign a Duplicate GID (Group ID) to an already created Group

We can create Multiple Groups with the same GID. Here I have some group as shown below.

[root@localhost ~]# tail -n 4 /etc/group
helpdesk:x:500:
developers:x:501:
engineers:x:555:
workers:x:557:

Now let’s change one of the groups GID and assign some other Groups ID. We can do so by using groupmod command with argument -o. Here I am going to change the GID of Group workers and will assign the GID of group engineers. Refer to the command below.

[root@localhost ~]# groupmod -o -g 555 workers   # Create Multiple Groups with same GID
[root@localhost ~]# tail -n 4 /etc/group
helpdesk:x:500:
developers:x:501:
engineers:x:555:
workers:x:555:

Also Read – Managing Users And Groups In Linux – A Complete Guide For Beginners

Change GID of a Group

groupmod is used to modify an already created group.

To change the GID of an already created group you can use groupmod command with argument -g. Here I am changing the GID of group workers.

[root@localhost ~]# groupmod -g 557 workers  # Change GID of a already created Group
[root@localhost ~]# cat /etc/group | grep workers
workers:x:557:

For more Help on groupmod command, you can use below command.

[root@localhost ~]# groupmod -h  # For more help on groupmod command.
Usage: groupmod [options] GROUP

Options:
  -g, --gid GID                 change the group ID to GID
  -h, --help                    display this help message and exit
  -n, --new-name NEW_GROUP      change the name to NEW_GROUP
  -o, --non-unique              allow to use a duplicate (non-unique) GID
  -p, --password PASSWORD       change the password to this (encrypted)
                                PASSWORD

Add User into a Group

Now our next group management command is gpasswd.

You can add users into a group using gpasswd command with argument -a. Here I am adding the user itsmarttricks in group developers.

[root@localhost ~]# gpasswd -a itsmarttricks developers   # Adding user in to a Group
Adding user itsmarttricks to group developers
[root@localhost ~]# cat /etc/group | grep developers
developers:x:501:itsmarttricks

Delete/Remove User from a Group

To delete or remove a user from a group you can use gpasswd with the argument -d. Here I am removing the user itsmarttricks from group developers.

[root@localhost ~]# gpasswd -d itsmarttricks developers   # Remove user from a Group
Removing user itsmarttricks from group developers
[root@localhost ~]# cat /etc/group | grep developers
developers:x:501:

Add Multiple Users into a Group

You can add multiple users into a group using gpasswd command with argument -M. Here I am adding users i.e. itsmarttricks, user1, and user2 in group developers.

[root@localhost ~]# gpasswd -M itsmarttricks,user1,user2 developers  # Adding Multiple users in to a Group
[root@localhost ~]# cat /etc/group | grep developers
developers:x:501:itsmarttricks,user1,user2

Set Password for a Group

We can set a password for a Group using gpasswd command. Refer to the command below.

[root@localhost ~]# gpasswd developers   # Set Password for a Group
Changing the password for group developers
New Password: 
Re-enter new password: 

Make a Group Member as a Group Administrator

You can make a user as an administrator of Group. To do so you can use gpasswd command with argument -A. Here I am making user itsmarttricks as an administrator of Group developers.

[root@localhost ~]# gpasswd -A itsmarttricks developers  # Make a User as a Group Administrator

That’s all, In this article, we have explained Group Management Command In Linux (Groupadd, Groupdel, Groupmod, Gpasswd). I hope you enjoy this article. If you like this article, then just share it. If you have any questions about this article, please comment.

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Mangesh Dhulap

This is Mangesh Dhulap the Founder and Editor of IT SMART TRICKS have 6+ years of Industrial Experience. We expect from our visitors to like, share, and comment on our posts.

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