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13. Changing file attributes

A file is not merely its contents, a name, and a file type (see section 12. Special file types). A file also has an owner (a userid), a group (a group id), permissions (what the owner can do with the file, what people in the group can do, and what everyone else can do), various timestamps, and other information. Collectively, we call these a file's attributes.

These commands change file attributes.

13.2 chgrp: Change group ownership  Change file groups.
13.3 chmod: Change access permissions  Change access permissions.
13.1 chown: Change file owner and group  Change file owners and groups.
13.4 touch: Change file timestamps  Change file timestamps.

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