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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.
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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