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Each and every file on a computer has what we call file permissions. These are attributes of the file that determine who has permission to access that file and what they can do to that file. The System Administrator has complete access to all the files on these files. There are three types of file permissions: readable, writeable, execute and readable. The last three spaces (r--) are the file permissions of the user. They can be either r, w, or x, for read, write or execute.