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Top Forums Shell Programming and Scripting Complex find and replace only 1st instance string with dynamic combination Post 302560686 by SilvesterJ on Friday 30th of September 2011 02:05:50 PM
Old 09-30-2011
Complex find and replace only 1st instance string with dynamic combination

test.txt is the dynamic file but some of combination are fix

like below are the lines
Code:
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

the test.txt can content them in any order

Code:
#cat test.xt 
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

OR

Code:
#cat test.xt 
wonder_off =
wonder_off = disabled
;wonder_off =
;wonder_off = disabled

I need to find and replace only 1st instatnce of the test.xt

example if:

Code:
#cat test.xt 
;wonder_off =
;wonder_off = disabled
wonder_off =
wonder_off = disabled

find ";wonder_off =" and replace it with "wonder_off = "Enabled,working_bar,extra_deft""


Result should be :
Code:
cat test.xt 
wonder_off = "Enabled,working_bar,extra_deft"
;wonder_off = disabled
wonder_off =
wonder_off = disabled


I can managed to get only 1st line which can be any combination i mention above
Code:
#VAR=`cat test.xt | head -1`


#echo $VAR
;wonder_off =

How can I Find only 1st instance with matching string and replace it with "wonder_off = "Enabled,working_bar,extra_deft""

Last edited by Scott; 09-30-2011 at 03:30 PM.. Reason: CODE TAGS...
 

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Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
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