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Top Forums Shell Programming and Scripting Pattern matching in file and then display 10 lines above every time Post 302162949 by KevinADC on Wednesday 30th of January 2008 08:05:57 PM
Old 01-30-2008
If I was going to use perl I would just use Tie::File, then you can treat the file like an array and use array subscripting to backtrack 10 lines. But he seems to want a shell script so I can't help with that unless calling a perl script is OK.
 

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Prima::Tie(3)						User Contributed Perl Documentation					     Prima::Tie(3)

NAME
Prima::Tie - tie widget properties to scalars or arrays. DESCRIPTION
Prima::Tie contains two abstract classes, "Prima::Tie::Array" and "Prima::Tie::Scalar", which tie an array or a scalar to a widget's arbitrary array or scalar property. Also, it contains classes "Prima::Tie::items", "Prima::Tie::text", and "Prima::Tie::value", which tie a variable to a widget's items, text, and value property respectively. SYNOPSIS
use Prima::Tie; tie @items, 'Prima::Tie::items', $widget; tie @some_property, 'Prima::Tie::Array', $widget, 'some_property'; tie $text, 'Prima::Tie::text', $widget; tie $some_property, 'Prima::Tie::Scalar', $widget, 'some_property'; USAGE
These classes provide immediate access to a widget's array and scalar property, in particular to popular properties as items and text. It is considerably simpler to say splice(@items,3,1,'new item'); than to say my @i = @{$widget->items}; splice(@i,3,1,'new item'); $widget->items(@i); You can work directly with the text or items rather than at a remove. Furthermore, if the only reason you keep an object around after creation is to access its text or items, you no no longer need to do so: tie @some_array, 'Prima::Tie::items', Prima::ListBox->create(@args); As opposed to: my $widget = Prima::ListBox->create(@args); tie @some_array, 'Prima::Tie::items', $widget; "Prima::Tie::items" requires "::items" property to be available on the widget. Also, it takes advantage of additional "get_items", "add_items", and the like if available. Prima::Tie::items The class is applicable to "Prima::ListViewer", "Prima::ListBox", "Prima::Header", and their descendants, and in limited fashion to "Prima::OutlineViewer" and its descendants "Prima::StringOutline" and "Prima::Outline". Prima::Tie::text The class is applicable to any widget. Prima::Tie::value The class is applicable to "Prima::GroupBox", "Prima::ColorDialog", "Prima::SpinEdit", "Prima::Gauge", "Prima::Slider", "Prima::CircularSlider", and "Prima::ScrollBar". COPYRIGHT
Copyright 2004 Teo Sankaro You may redistribute and/or modify this module under the same terms as Perl itself. (Although a credit would be nice.) AUTHORS
Teo Sankaro, <teo_sankaro@hotmail.com>. Dmitry Karasik, <dmitry@karasik.eu.org>. perl v5.14.2 2009-02-24 Prima::Tie(3)
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