Understanding access permissions

There are three types of permissions:

   r  - read the file or directory
   w  - write to the file or directory
   x  - execute the file or search the directory

Each of these permissions can be set for any one of three types of user:

   u  - the user who owns the file (usually you)
   g  - members of the group to which the owner belongs
   o  - all other users

The access permissions for all three types of user can be given as a string of nine characters:

   user		group		others
   r w x	r w x		r w x

These permissions have different meanings for files and directories.

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