whatis root-user
Root User
Also known as: root, superuser, UID 0
The Linux superuser account with user ID 0, which bypasses normal permission checks and can change anything on the system.
What Is the Root User in Linux?
Root is the administrative account on every Linux system. The kernel grants it privileges based on UID 0, not the name, so root can read any file, kill any process, and bind to low-numbered ports.
Logging in as root for daily work is risky because one typo can wreck the system. Most distributions disable direct root login and have you run individual commands with sudo instead. The root user is also different from the root directory /, despite the shared name.
Example
id root
# uid=0(root) gid=0(root) groups=0(root)Learn more about Root User
- Sudo Explained sudo lets non-root users run commands with elevated privileges in a controlled, auditable way. This guide covers how sudo works, how to configure /etc/sudoers, and common patterns for granting the right level of access.
- Linux Users, Groups, and Ownership Explained Linux is a multi-user operating system built around a clear identity model. Understanding users, groups, UIDs, GIDs, sudo, and the root account is essential for administering any Linux system.
- Linux Security Best Practices A practical security checklist for Linux systems -- covering user privileges, SSH hardening, firewall setup, automatic updates, file integrity monitoring, and auditing tools like Lynis.