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To get access to files on Linux, permissions are used. These permissions are assigned to three entities: the file owner, the group owner, and the others entity (which is everybody else). In this chapter, you learn how to apply permissions. The chapter starts with an overview of the basic partitions, after which the special permissions and access control lists (ACLs) are discussed. At the end of this chapter, setting default permissions through the umask is covered, as is managing user extended attributes.