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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

Linux Bridge
A software-based network switch in the Linux kernel that connects multiple network interfaces at Layer 2, enabling VM and container networking.
Process
A running instance of a program, with its own memory space, process ID, and system resources.
Linux Kernel Module
A piece of code that can be loaded into the kernel at runtime to extend functionality without rebooting, such as device drivers and filesystems.
Top/Htop
Interactive process viewers that display real-time system resource usage including CPU, memory, and running processes.
ACL (Access Control List)
An extension to standard Linux file permissions that allows setting fine-grained access rights for specific users and groups beyond owner/group/other.
Cgroup
A Linux kernel feature that limits, accounts for, and isolates resource usage of process groups.
 View All Linux Terms →