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This article was posted to the Usenet group alt.hackers in 1995; any technical information is probably outdated.

Re: Boolean Grep?

Article: 7821 of alt.hackers
From: (Peter Seebach)
Newsgroups: alt.hackers
Subject: Re: Boolean Grep?
Date: 15 May 1995 10:13:48 -0500
Organization: Solutions Online
Lines: 32
Message-ID: 3p7r3c$
Status: RO

In article <3oqqi6$>,
Bruce Guenter <guentbru@HERCULES.CS.UREGINA.CA> wrote:
>>Ack!!  That's disgusting.  Didn't your parents teach you not to use
>>csh in public?  Try /bin/sh instead:

>Amen!  Or even better, /bin/bash (or /bin/ksh if all else fails)

sh over ksh over bash, for simple scripts.  Otherwise, ksh over bash over
sh.  But sh wins big over bash; it's small, fast, and clean.  bash is
laden with bogosities.  ksh is cleaner.

rc is the correct solution, of course.

>>grep pattern file1 file2 file3 > /dev/null && echo true

>I just don't get it.  Why send output to /dev/null when *grep has an
>option to make it silent:

>grep -s pattern file1 file2 file3 && echo true

At Least One Grep has no '-s' option.

ObHack: A program which checks the return status of commands and returns
'true' or 'false'.  It almost works.  It probably would have worked had I not
been using hp-ux.

Peter Seebach -  --
C/Unix proto-wizard -- C/Unix questions? Send mail for help.
Moderator - alt.religion.kibology, comp.lang.c.moderated
Copyright 1995 Peter Seebach.  Not for distribution through Microsoft Network.

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