Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site reed.UUCP
Path: utzoo!watmath!clyde!cbosgd!ihnp4!alberta!ubc-vision!uw-beaver!tektronix!reed!alexis
From: alexis@reed.UUCP (Alexis Dimitriadis)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: Sv.2 suid bits and shell scripts
Message-ID: <2210@reed.UUCP>
Date: Fri, 29-Nov-85 04:29:45 EST
Article-I.D.: reed.2210
Posted: Fri Nov 29 04:29:45 1985
Date-Received: Sat, 30-Nov-85 06:36:26 EST
References: <123@rexago1.UUCP>
Reply-To: alexis@reed.UUCP (Alexis Dimitriadis)
Distribution: net
Organization: Reed College, Portland, Oregon
Lines: 37
Xref: watmath net.unix:6440 net.unix-wizards:15906

re `interpreter' is most often "/bin/sh" or "/bin/csh".  The _kernel_
regognizes this, and starts the specified interpreter,  setting its
effective uid if the script is setuid.  Use at your own risk.

Bonus for 4.2 types:
  A single argument may follow the `interpreter' name, if it is
separated by exactly one space (aaargh..).  This makes it possible to
write an awk or sed script, say `foo', and run it by typing `foo',
without the overhead of exec'ing a shell, like this:

#! /bin/awk -f 
(awk commands here)

The kernel tacks the filename at the end, so awk sees

	/bin/awk -f /u/ss/alexis/bin/foo

and everything is peachy.  This is a really handy trick that I have not
seen used before, so I thought I'd throw it in.

Alexis Dimitriadis
-- 
_______________________________________________
Any opinions expressed above have been grown organically and contain
no preservatives or artificial sweeteners.

				alexis @ reed
    {decvax,ihnp4,ucbcad,uw-beaver}!tektronix!reed.UUCP