🎁 New User? Get 20% off your first purchase with code NEWUSER20 Register Now →
Menu

Categories

Linux Beginner

What is Chmod?

A command to change file and directory access permissions using numeric or symbolic notation.

Chmod modifies read (r=4), write (w=2), and execute (x=1) permissions for owner, group, and others. Numeric: chmod 755 file (owner=rwx, group=rx, others=rx). Symbolic: chmod u+x file (add execute for owner).

Common permissions: 644 (files — owner rw, others read), 755 (directories/scripts — owner rwx, others rx), 600 (private files — owner only). The -R flag applies recursively. Understanding permissions is fundamental to Linux security.

Related Terms

File Permissions
A security mechanism that controls who can read, write, or execute files and directories in Unix-like systems.
Package Manager
A tool that automates the process of installing, updating, configuring, and removing software packages.
Nftables
The modern Linux packet filtering framework that replaces iptables with a unified, more efficient rule-processing architecture.
Environment Path
The PATH variable that tells the shell which directories to search when looking for executable commands.
RAID
Redundant Array of Independent Disks — a technology combining multiple physical drives into a single unit for performance, redundancy, or both.
Wget
A command-line utility for downloading files from the web, supporting HTTP, HTTPS, and FTP protocols.
 View All Linux Terms →