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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!houxz!vax135!ukc!edcaad!hwcs!jim
From: jim@hwcs.UUCP (Jim Crammond)
Newsgroups: net.unix-wizards
Subject: Re: Fun With #! Lines
Message-ID: <121@hwcs.UUCP>
Date: Sun, 19-Aug-84 04:12:23 EDT
Article-I.D.: hwcs.121
Posted: Sun Aug 19 04:12:23 1984
Date-Received: Thu, 9-Aug-84 04:48:15 EDT
References: <7977@umcp-cs.UUCP>
Organization: Computer Sci., Heriot-Watt U., Scotland
Lines: 16

I have a file called 'todo' which begins with the line

	#!/usr/ucb/vi +2vi

Thus if I execute it, it vi's itself. The +2 is so it starts on the second line,
the 'vi' forces it into visual mode as it goes into open mode otherwise,
(a feature I presume).

Perhaps more useful is the way I've heard it is used in MU-Prolog:
When the MU-Prolog interpreter saves the program currently in memory
it dumps various structures into a file preceded by a
	#!/usr/..../muprolog
Thus the saved file can be executed directly, it automatically calls up the
interpreter to read itself in and execute.

-Jim Crammond.		..!ukc!edcaad!hwcs!jim