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From: jrw@hropus.UUCP (Jim Webb)
Newsgroups: net.micro.att
Subject: Re: UNIX PC command surprises...
Message-ID: <379@hropus.UUCP>
Date: Mon, 24-Mar-86 18:04:17 EST
Article-I.D.: hropus.379
Posted: Mon Mar 24 18:04:17 1986
Date-Received: Thu, 27-Mar-86 06:59:50 EST
References: <351@hropus.UUCP> <888@kitty.UUCP>
Organization: Bell Labs, Holmdel, NJ
Lines: 33

> In article <351@hropus.UUCP>, jrw@hropus.UUCP (Jim Webb) (me) writes:
> > 	Has anyone else out there noticed that on the "7300" the
> > 	grep, egrep, and fgrep commands are IDENTICAL.  
> >
> > 	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.

Golly gee...that's why cp and ln are linked as well!  Boy, am I learning stuff
today!

NOW, IF ONLY THE GREP COMMANDS *WORKED* ON THE 7300 THE WAY THEY
ARE SUPPOSED TO, I WOULD BELIEVE THAT THEY LOOKED AT ARGV[0] BUT SINCE THEY
DON'T I DON'T BELIEVE YOUR LITTLE PROGRAMMING EXAMPLE DOES ANYTHING FOR MY
GRIPE.

Why don't you go login to a 7300 some time and test out an egrep expression
like I stated above (nproc|NPROC) and you will see that it does not work.

Also, egrep is a yacc/lex program in ATT System V while grep is written in
straight C so I don't know how it is so similar.

Sorry to take up so much room here...
-- 
Jim Webb                                        ihnp4!houxm!hropus!jrw