Linux Add Group

How to Add a Group in Linux

In Linux, groups are used to manage permissions for multiple users efficiently. The groupadd command allows administrators to create new groups for better access control.

Syntax of groupadd Command

groupadd [OPTIONS] group_name

Creating a New Group

To add a new group, use:

sudo groupadd developers

This creates a group named developers.

Verify Group Creation

Check if the group exists:

getent group developers

Or, view all groups in the system:

cat /etc/group

Adding a User to a Group

To add an existing user to a group:

sudo usermod -aG developers username

Example:

sudo usermod -aG developers alice

Now, alice is part of the developers group.

Creating a Group with a Specific GID

Each group has a unique Group ID (GID). To specify a custom GID:

sudo groupadd -g 5000 project_team

This creates project_team with GID 5000.

Creating a System Group

A system group is used for system processes and services:

sudo groupadd -r sysadmin

The -r flag creates a system group with a GID below 1000.

Deleting a Group

To remove a group:

sudo groupdel developers

Listing All Groups in Linux

To view all groups on the system:

cut -d: -f1 /etc/group

Difference Between groupadd and usermod -aG

Command	Purpose
groupadd	Creates a new group.
usermod -aG	Adds a user to an existing group.

Conclusion

The groupadd command is essential for managing user permissions in Linux. Proper group management ensures secure and organized access control.

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