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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: net.micro.att
Subject: Re: UNIX PC command surprises...
Message-ID: <2012@brl-smoke.ARPA>
Date: Sun, 23-Mar-86 04:23:24 EST
Article-I.D.: brl-smok.2012
Posted: Sun Mar 23 04:23:24 1986
Date-Received: Tue, 25-Mar-86 05:01:28 EST
References: <351@hropus.UUCP> <888@kitty.UUCP>
Reply-To: gwyn@brl.ARPA
Organization: Ballistic Research Lab (BRL)
Lines: 19

In article <888@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>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.
>
>	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.

What makes you think the source code for grep & egrep is similar?
They haven't been at all similar from the beginning through SVR2.