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Full Discussion: Grep line above X condition
Homework and Emergencies Homework & Coursework Questions Grep line above X condition Post 302416971 by EAGL€ on Wednesday 28th of April 2010 07:08:52 AM
Old 04-28-2010
its no that easy to achive your requirement, but i can partially help you.

first of all to find Nth occurance of a pattern in a file use this one liner (N=4):

Code:
nawk -F\: -v occ="4" '$NF~/pattern/{i++} i==occ{print $0;exit}' infile

and to be able to get 1 line before (1 line above!) and 0 line after a pattern:

Code:
/usr/sfw/bin/ggrep "pattern" -A0 -B1 infile

using the above knowlende you can try to create a script for your aim.

regards
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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