Linux useradd Guide

Complete beginner-friendly guide to useradd on Linux, covering Arch Linux, CachyOS, and other distributions including creating users, user configuration, and user management.

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Table of Contents

1. Understanding useradd
2. Creating Users
3. User Configuration
4. User Management
5. Troubleshooting

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Understanding useradd

What is useradd?

useradd creates new user accounts.

Uses:

• Create users: Add new user accounts
• Set defaults: Configure user defaults
• User management: Manage system users
• Multi-user systems: Support multiple users

Why it matters:

• Security: Separate user accounts
• Organization: Organize system access
• Permissions: Control file access

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Creating Users

Basic User Creation

Create user:

# Create user
sudo useradd username

# Create with home directory
sudo useradd -m username

# Set password
sudo passwd username

User with Groups

Add to groups:

# Create user in wheel group
sudo useradd -m -G wheel username

# Create with specific UID
sudo useradd -m -u 1001 username

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User Configuration

User Options

Common options:

# Create user with options
sudo useradd -m -s /bin/bash -G wheel,users username

# Options:
# -m: Create home directory
# -s: Set shell
# -G: Add to groups
# -u: Set UID
# -g: Set primary group

Default Shell

Set shell:

# Create with zsh
sudo useradd -m -s /bin/zsh username

# Create with fish
sudo useradd -m -s /usr/bin/fish username

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User Management

Modify User

Change user:

# Modify user
sudo usermod -aG group username

# Change shell
sudo usermod -s /bin/zsh username

# Lock account
sudo usermod -L username

Delete User

Remove user:

# Delete user
sudo userdel username

# Delete with home directory
sudo userdel -r username

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Troubleshooting

User Creation Errors

Check issues:

# Check if user exists
id username

# Check groups
groups username

# Check home directory
ls -la /home/username

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Summary

This guide covered useradd usage, user creation, and management for Arch Linux, CachyOS, and other distributions.

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Next Steps

• User and Groups - User management
• passwd Guide - Password management
• sudo Guide - sudo setup
• useradd Documentation: man useradd

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This guide covers Arch Linux, CachyOS, and other Linux distributions. For distribution-specific details, refer to your distribution's documentation.