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  1. or download this
    (fastolfe) eddie:~$ ls -l test
-rwsrwxr-x   1 root     fastolfe       53 Nov 13 16:17 test
...
printf("uid=%d euid=%d\n", $<, $>);
(fastolfe) eddie:~$ uname -a
Linux eddie.intranet 2.2.16 #1 Thu Jun 8 17:46:12 CDT 2000 i586 unknow
+n
  2. or download this
    ($<, $>) = ($>, $<);