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unlink - remove directory entry
Name points to a null-terminated string. Unlink removes the entry for the file pointed to
by name from its directory. If this entry was the last link to the file, the contents of
the file are freed and the file is destroyed. If, however, the file was open in any
process, the actual destruction is delayed until it is closed, even though the directory
entry has disappeared.
Zero is normally returned; -1 indicates that the file does not exist, that its directory
cannot be written, or that the file contains pure procedure text that is currently in use.
Write permission is not required on the file itself. It is also illegal to unlink a
directory (except for the super-user).
(unlink = 10.)
sys unlink; name
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