chmod Quick Reference Summary

The general form of the chmod command:

   chmod options file

The options are constructed by choosing one from each of these columns, with no blank between them:

Who	Operation	Permission
A combination of:     u user (file owner)     g group     o others     a all (same as ugo)	Permissions are:     = assigned     + added     - subtracted	A combination of:     r read     w write     x execute or one of the following to copy permissions:     u user     g group     o other or, to set user id:     s

Note: Set User ID is usually used only with programs. You may set the s permission for the user or group; people who run the program will then “adopt” the identity of that user or group for the duration of the program.

<< Set User ID

Index

chmod by the Numbers >>