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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: net.micro.att
Subject: Re: UNIX PC command surprises...
Message-ID: <888@kitty.UUCP>
Date: Wed, 19-Mar-86 20:23:21 EST
Article-I.D.: kitty.888
Posted: Wed Mar 19 20:23:21 1986
Date-Received: Mon, 24-Mar-86 00:27:10 EST
References: <351@hropus.UUCP>
Organization: Recognition Research Corp., Clarence, NY
Lines: 25
Summary: Haven't you heard of argv[0]?

In article <351@hropus.UUCP>, jrw@hropus.UUCP (Jim Webb) writes:
> 	Has anyone else out there noticed that on the "7300" the
> 	grep, egrep, and fgrep commands are IDENTICAL.  The other
> 	day I did an egrep "nproc|NPROC" or some such thing and
> 	it failed!  A quick cmp of grep and egrep yielded no 
> 	differences, in fact, grep and fgrep are linked together.
> 
> 	Boy, and to think that people pay extra to get egrep
> 	with the Development Set....

	Aw, come on!  *THINK*  I'm suprised that you haven't discovered that
``edit'', ``ex'', and ``vi'' are also identical and are linked together.  Does
that mean they are the same?
	In case you still don't know the answer...  In an program, argv[0] is
the NAME by which the program was invoked.  Since the source code for grep and
egrep is very similar, the same compiled program is used, with the argv[0]
being used to switch the internal program logic.  The same situation is also
used for the above editors.

==>  Larry Lippman @ Recognition Research Corp., Clarence, New York        <==
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