3.9.4 Changing permissions


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        The command chmod is used to set the permissions on a file. Only the owner of a file may change the permissions on that file. The syntax of chmod is:

chmod {a,u,g,o}{+,-}{r,w,x}

Briefly, you supply one or more of all, user, group, or other. Then you specify whether you are adding rights (+) or taking them away (-). Finally, you specify one or more of read, write, and execute. Some examples of legal commands are:

chmod a+r stuff Gives all users read access to the file. chmod +r stuff Same as above—if none of a, u, g, or o is specified, a is assumed. chmod og-x stuff Remove execute permission from users other than the owner. chmod u+rwx stuff Allow the owner of the file to read, write, and execute the file. chmod o-rwx stuff Remove read, write, and execute permission from users other than the owner and users in the file’s group.


Next: 3.10 Managing file links Up: 3.9 File Permissions Previous: 3.9.3 Dependencies

Matt Welsh
mdw@sunsite.unc.edu

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