Chmod command

From Linux Shell Scripting Tutorial - A Beginner's handbook
Jump to: navigation, search

This article is a stub. You can help us by expanding it.

The 'chmod command is used to change the access permissions of a file. The syntax is as follows:

chmod ugo+rwx filename

Where,

  • u : Users
  • g : Groups
  • o : Others
  • + : Adds the permission
  • - : Removes the permission
  • = : Overwrites current permissions
  • r : Read permission
  • w : Write permission
  • x : Execute permission

A numerical way to express permission is as follows:

  • 4 : Read permission
  • 2 : Write permission
  • 1 : Execute permission
  • 7 : Read, write, and execute permissions
  • 0 : No permissions at all