August 2000
Intermediate to advanced
896 pages
28h 17m
English
book
UNIX System Administration Handbook, Third Edition
by Scott Seebass, Garth Snyder, Evi Nemeth, Trent R. Hein
Content preview from UNIX System Administration Handbook, Third Edition
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3.1 Ownership of files and processes
Every UNIX file has both an owner and a “group owner.” The owner of the file enjoys one special privilege that is not shared with everyone on the system: the ability to modify the permissions of the file. In particular, the owner can set the permissions on a file so restrictively that no one else can access it.1 We take up the subject of file permissions in Chapter 5, The Filesystem.
While the owner of a file is always a single person, many people may be group owners of the file, so long as they are all part of a single UNIX group. Groups are defined in the /etc/group file.
See page 79 for more information about groups.
The owner of a file gets to specify what the group owners can do with it. This scheme ...
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