🎁 New User? Get 20% off your first purchase with code NEWUSER20 · ⚡ Instant download · 🔒 Secure checkout Register Now →
Menu

Categories

Linux Beginner

What is Root User?

The superuser account in Unix/Linux systems with unrestricted access to all commands and files.

The root user (UID 0) has complete control over the system. Root can read, write, and execute any file, install software, modify system configurations, and manage other user accounts.

Because of its power, running as root is dangerous — a single mistake can damage the entire system. Best practice is to use sudo for temporary privilege escalation instead of logging in as root directly.

Related Terms

Iptables
The traditional Linux firewall tool that filters network packets using configurable chains of rules organized in tables.
Firewalld
A dynamic firewall management tool for Linux that provides a D-Bus interface for managing firewall rules with zones.
SSH (Secure Shell)
A cryptographic network protocol for secure remote login and command execution over an unsecured network.
AppArmor
A Linux security module that restricts program capabilities using per-application profiles, simpler to configure than SELinux.
SELinux
Security-Enhanced Linux — a mandatory access control system that confines programs to minimum required privileges beyond standard file permissions.
Crontab Syntax
The time specification format used in cron job scheduling, with five fields defining minute, hour, day of month, month, and day of week.
 View All Linux Terms →