Fedora? Solaris.

Exactly as predicted, your script works as intended as I run it myself, but shows the same problem as the one I complained about, once I suid it, and run it as an other user: 

$ id
uid=54482(emagiro) gid=17465(ath)
$ /tmp/showfile
$0 /tmp/showfile
filename /tmp/showfile
__FILE__ /tmp/showfile
$ chmod u+s /tmp/showfile
$ ll /tmp/showfile
-rwsr-xr-x   1 emagiro  ath          208 Sep 15 16:37 /tmp/showfile

~> id
uid=33629(eeivob05) gid=17465(ath)
~> /tmp/showfile
$0 /dev/fd/4
filename /dev/fd/4
__FILE__ /dev/fd/4

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In reply to Re^4: $0 in suid enabled script (not SUID) by cramdorgi
in thread Insecure dependency in system under -T, with list form invocation by cramdorgi

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