Deletes a list of files.
(Under Unix, it will remove a link to a file, but the file may
still exist if another link references it.)
If list is omitted, it unlinks the file given in
The function returns the number of files successfully deleted.
unlink will not delete directories
unless you are the superuser and the -U flag is
supplied to Perl. Even if these conditions are met, be warned that unlinking a
directory can inflict serious damage on your filesystem. Use