293 captures

20 May 2000 - 16 May 2025

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Organization: Alexa Crawls

Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.

Collection: Alexa Crawls

Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.

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chmod Tutorial

This tutorial is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Back to Dave Eisenberg’s Home Page

This is a tutorial that teaches the UNIX ®/Linux ® chmod command. It presumes that you already know how to use the ls command to list the contents of a directory. The tutorial has been tested with Mozilla version 1.8 under Linux.

What is chmod?

chmod is a Unix command that lets you tell the system how much (or little) access it should permit to a file.

Here are all the topics:

• Changing File Permissions
• Your Permissions
• Group Permissions
• Others’ Permissions
• The chmod command
• chmod Examples
• Try chmod
• chmod Shortcuts
• Copying Permissions
• Try chmod again
• A Problem Solved
• A New Problem
• Setting User ID
• Quick Reference Summary
• chmod by the Numbers
• Numeric Mode in Action

You may download this tutorial as a gzipped tar file.

UNIX is a registered trademark of The Open Group.
Linux is a registered trademark of Linus Torvalds.