IntroToLinux

4. Group Management

Creating Groups:

# Create new group
sudo groupadd newgroup

# Create group with specific GID
sudo groupadd -g 2000 newgroup

# Create system group
sudo groupadd -r systemgroup

Modifying Groups:

# Change group name
sudo groupmod -n newname oldname

# Change group GID
sudo groupmod -g 2500 groupname

# Add user to group
sudo usermod -aG groupname username
sudo gpasswd -a username groupname

# Remove user from group
sudo gpasswd -d username groupname

# Set group administrators
sudo gpasswd -A admin1,admin2 groupname

Deleting Groups:

# Delete group
sudo groupdel groupname

# Alternative (Debian/Ubuntu)
sudo delgroup groupname

Group Membership Management:

# Check group members
getent group groupname

# List all groups
getent group

# Add multiple users to group
for user in alice bob charlie; do
    sudo usermod -aG developers $user
done

# Create group and add users in one operation
sudo groupadd project-team
sudo usermod -aG project-team alice
sudo usermod -aG project-team bob

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Lesson Home: ↑ Lesson 9: Users & Groups Course Home: ⌂ Introduction to Linux