From owner-freebsd-questions  Wed Jan 16 19:14:24 2002
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Date: Wed, 16 Jan 2002 22:16:09 -0500
From: parv <parv_@yahoo.com>
To: Drew Tomlinson <drew@mykitchentable.net>
Cc: f-q <freebsd-questions@freebsd.org>
Subject: Re: Regular Expression Syntax
Message-ID: <20020117031609.GA89501@moo.holy.cow>
Mail-Followup-To: Drew Tomlinson <drew@mykitchentable.net>,
	f-q <freebsd-questions@freebsd.org>
References: <200201170250.NAA05050@tungsten.austclear.com.au> <003701c19f02$d6024af0$0301a8c0@bigdaddy>
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in message <003701c19f02$d6024af0$0301a8c0@bigdaddy>, 
wrote Drew Tomlinson thusly...
>
> ----- Original Message -----
> From: "Tony Landells" <ahl@austclear.com.au>
...
> > drew@mykitchentable.net said:
> > > How can I get the opposite?  In other words, everything except
> > > cvsup or portupgrade?  
> >
> > What, you mean something like...
> >
> >        -v, --invert-match
> >               Invert  the sense of matching, to select non-match-
> >               ing lines.
> >
> > from the grep/egrep/fgrep/zgrep man page?
...
> I just tried that and it returned everything but the cvsup.  But it
> did return the portupgrade line which I don't want.  

did you really try egrep?  perhaps you used another grep or mistyped
"portupgrade"(?).


> I know from
> reading somewhere that I'm supposed to be able to take the
> "portupgrade|cvsup" and negate the expression to mean "every line
> except those containing portupgrade or cvsup".

over here, following two commands don't produce anything (thus
extended grep w/ -v option works)....

pkg_info | egrep -v  'portupgrade|cvsup' | egrep 'portupgrade|cvsup'
pkg_info | grep -vE  'portupgrade|cvsup' | egrep 'portupgrade|cvsup'


...or you could just use awk to do work of grep...

pkg_info | awk '/portupgrade|cvsup/ {print "pkg_deinstall " $1}'
pkg_info | awk '! /portupgrade|cvsup/ {print "pkg_deinstall " $1}'

  - parv

-- 
 

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