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From: ed@mtxinu.UUCP (Ed Gould)
Newsgroups: net.unix-wizards
Subject: Re: Relative speed of Bourne vs. C Shells - C Shell is faster.
Message-ID: <348@mtxinu.UUCP>
Date: Wed, 17-Apr-85 12:29:35 EST
Article-I.D.: mtxinu.348
Posted: Wed Apr 17 12:29:35 1985
Date-Received: Sat, 20-Apr-85 07:11:38 EST
References: <216@sdcc12.UUCP> <12138@watmath.UUCP> <84@tekcrl.UUCP> <179@tektools.UUCP> <162@hadron.UUCP>
Organization: mt Xinu, Berkeley, CA
Lines: 17

> > 	#! /bin/awk -f
> 
> Near as I can tell, the first line only works if you are running the
> C shell under 4BSD, which interprets the #! business.

On 4.1BSD and later systems, #! is a magic number that the kernel
exec routine recognizes.  The format of the line is

    #!<space-or-tab><interpreter-full-path-name><space-or-tab><argument>\n

Only one argument may be supplied.  Any interpreter may be specified;
the above example uses /bin/awk rather than the more common /bin/sh
and /bin/csh.

-- 
Ed Gould		    mt Xinu, 739 Allston Way, Berkeley, CA  94710  USA
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