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chmod is the *nix command to set permissions on a file or folder.
Usually you would change those permissions with an ftp program if you dont have shell access on your server.
(which you won´t have in shared hosting environment)
Just google for an explanation ... there are plenty on the web. Here is one for example:
http://docs.cs.byu.edu/docs/linuxpermissions/2.php
or this one:
http://www.htmlite.com/php042.phpSo it actually depends on who needs what access to a file.
Are you looking for permissions for a specific module or for XOOPS basic installation?