How to Manage Users and Groups on Linux

Linux uses users and groups to control access to files and resources.

User Management

# Create user
adduser newuser

# Delete user
userdel newuser

# Delete user and home directory
userdel -r newuser

# Change password
passwd newuser

# Lock user account
usermod -L newuser

# Unlock user account
usermod -U newuser

Group Management

# Create group
groupadd mygroup

# Add user to group
usermod -aG mygroup newuser

# Remove user from group
gpasswd -d newuser mygroup

# List user's groups
groups newuser

# List all groups
cat /etc/group

View Users

# All system users
cat /etc/passwd

# Currently logged-in users
who
w