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	Fri, 31 Oct 1997 12:50:47 +0100 (MEZ)
From: Robert Eckardt <roberte@mep.ruhr-uni-bochum.de>
Message-Id: <199710311150.MAA26262@beta.mep.ruhr-uni-bochum.de>
Subject: Re: Potential bug in 'grep'
In-Reply-To: <199710310449_MC2-2642-E24F@compuserve.com> from Malcolm Boff at "Oct 31, 97 04:49:16 am"
To: Malcolm_Boff@compuserve.com (Malcolm Boff)
Date: Fri, 31 Oct 1997 12:50:47 +0100 (MEZ)
Cc: freebsd-questions@FreeBSD.ORG
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> I have been checking out a pre-release set of software (GNU) and which
> uses a function in a shell script to determine whether or not the 'echo'
> command
> supports the '-e' flag (on FreeBSD it doesn't).

It doesn't ?

12:45 beta: /home/roberte 0% tcsh
12:45 beta: /home/roberte 0% (echo -e) | sed s/-e/xe/ | grep xe; echo $?
xe
0
12:46 beta: /home/roberte 0% echo -e
-e
12:47 beta: /home/roberte 0% sh
$ (echo -e) | sed s/-e/xe/ | grep xe; echo $?
1
$ echo -e

$ 

> To cut a long story short try the following :-
> 
>    (echo -e) | sed s/-e/xe/ | grep xe; echo $?
> 
> here sed returns 'xe' and therefore should satisfy a match with 'grep' and
> should return '0' but it returns a '1' (no match ?).
> 
> I think this is a 'bug' anyone agree ??

No. :-)


Robert

-- 
Dr. Robert Eckardt                                                 (
    Ruhr-Universitaet Bochum, Inst.f.Theor.Physik, NB6/169          )
    Universitaetsstrasse 150,   D-44780 Bochum,    Germany     ----X---8----
    Telefon: +49 234 700-3709,   Telefax: +49 234 7094-574             8
    E-Mail:  RobertE@MEP.Ruhr-Uni-Bochum.de                    --------8----
    URL:  http://WWW.MEP.Ruhr-Uni-Bochum.de/~roberte
>>> A magician never reveals his secret:  the unbelievable trick becomes <<<
>>>                             simple and obvious once it is explained. <<<