groupadd

The groupadd command is used to create a new group on a Linux system. Groups are essential for managing file permissions and organizing users who need access to shared resources.

Note: You need root or sudo privileges to execute this command.

Basic Syntax

groupadd [OPTIONS] GROUP_NAME

Common Flags/Options

Option	Description
-g, --gid GID	Specify the exact numerical Group ID (GID) for the new group.
-r, --system	Create a system group (typically assigns a GID lower than 1000).
-f, --force	Exit with success status if the specified group already exists.

Real-world Examples

1. Create a standard new group

The most basic usage simply takes the name of the new group. The system will automatically assign the next available GID (usually starting from 1000).

sudo groupadd developers

2. Create a group with a specific GID

If you have a strict permission structure across multiple servers, you might want to ensure a group has the exact same GID everywhere.

sudo groupadd -g 2050 marketing

3. Create a system group

System groups are generally meant for system processes, daemons, or services rather than human users.

sudo groupadd -r nginx

4. Verify group creation

After adding a group, you can verify it was created by searching the /etc/group file.

grep developers /etc/group

Output:

developers:x:1001: