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Top Forums Shell Programming and Scripting if match found go to a particular line in perl Post 302180381 by KevinADC on Monday 31st of March 2008 02:10:40 AM
Old 03-31-2008
Quote:
I am newbie to perl, just curious to know how to do the following in perl.
suppose I ve a txt file like below. when it founds "*Main Start"
Then go to "*Main End,,,,,,,," patteren and just collect the number from the previous line of "*Main End,,,,,,," pattern . In my case it is 5 . Then start excuting normally from the "*Main Start" position
You could use the Tie::File module for this which avoids the brute approach "era" mentioned. With Tie::File you treat a file like a perl array, so if you find a pattern in a certain line you just use simple array indexing to go back one line in the file. See the Tie::File (a perl core module) documentation for usage details.
 

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Tie::ToObject(3pm)					User Contributed Perl Documentation					Tie::ToObject(3pm)

NAME
Tie::ToObject - Tie to an existing object. SYNOPSIS
use Tie::ToObject; my $stolen = tied(%something); tie %something_else, 'Tie::ToObject', $stolen; DESCRIPTION
While "tie" in perldoc allows tying to an arbitrary object, the class in question must support this in it's implementation of "TIEHASH", "TIEARRAY" or whatever. This class provides a very tie constructor that simply returns the object it was given as it's first argument. This way side effects of calling "$object->TIEHASH" are avoided. This is used in Data::Visitor in order to tie a variable to an already existing object. This is also useful for cloning, when you want to clone the internal state object instead of going through the tie interface for that variable. VERSION CONTROL
This module is maintained using Darcs. You can get the latest version from <http://nothingmuch.woobling.org/code>, and use "darcs send" to commit changes. AUTHOR
Yuval Kogman <nothingmuch@woobling.org> COPYRIGHT
Copyright (c) 2008 Yuval Kogman. All rights reserved This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2008-01-17 Tie::ToObject(3pm)
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