[ILUG] sed question

[John Allen]

On Thursday 19 February 2004 20:21, Niall O Broin wrote:
> On Thursday 19 February 2004, padraig.brady at corvil.com (Padraig Brady) 
wrote:
> >OK I've a (very big) file like:
> >
> >0
> >0
> >1
> >1
> >2
> >2
> >3
> >3
> >
> >
> >I would like to find and print the "2" lines,
> >AND THEN STOP PRCOCESSING the humungous file.
> >
> >I was thinking of using sed, and the q command.
>
> As is so often the case when sed is mentioned, and awk is suggested, the
> correct answer is perl:
>
>
> perl -ne 'if (/(^)(2)/) {print} else { exit if $2}' humungous_file
>
>
> Before anyone jumps in - the () around the ^ are a tautology - I couldn't
> resist having the checking variable be called $2.
>
>
> Two characters less to type, and just a tiny bit less satisfying is:
>
>
> perl -ne 'if (/1^(2)/) {print} else { exit if $1}' humungous_file
>
>

This one does not work though.

>
>
> Niall

-- 
John Allen,                          mailto:john.allen at dublinux.net
MandrakeClub Silver Member.          http://www.dublinux.net

Mandrake Linux release 10.0 (RC1) for i586, kernel 2.4.22-21mdk
 07:59:32 up 13 days, 15:45,  2 users,  load average: 0.25, 0.10, 0.02