# Permissions: Read, Write and Run

Every file says who may read it, change it and run it, for its owner, its group and everyone else; ls -l shows it as letters such as rwxr-xr-x, chmod +x lets a program run, and chmod 644 or 600 sets all nine at once with numbers.

![Cheat sheet for the lesson Permissions: Read, Write and Run: Every file says who may read it, change it and run it, for its owner, its group and everyone else; ls -l shows it as letters such as rwxr-xr-x, chmod +x lets a program run, and chmod 644 or 600 sets all nine at once with numbers.](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/012084d7f8df49d8a8e4e8dfe47f6541.webp)

- Category: Bash
- Level: Apprentice
- Tags: chmod, file-permissions, linux, octal-permissions, unix
- Updated: November 10, 2026

Source: https://www.ask-codey.com/cheat-sheets/bash-permissions-cheat-sheet