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Top Forums Shell Programming and Scripting Script to capture string in a log file Post 302920221 by pratikgupta123 on Wednesday 8th of October 2014 07:54:12 AM
Old 10-08-2014
I am not having access to a machine right now so cant test a code but my logic would be something like this:

1. Loop on the file line by line
2. Add the line to an array by default
3. Continue adding the lines until you reach a line that starts with date.
4. At this point analyze if the existing lines in the array have exception word in it or not
5. If yes then print it to output file and flush the array and add next line to it
5. If no then flush the array and add next line to it
 

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IO::Lines(3)						User Contributed Perl Documentation					      IO::Lines(3)

NAME
IO::Lines - IO:: interface for reading/writing an array of lines SYNOPSIS
use IO::Lines; ### See IO::ScalarArray for details DESCRIPTION
This class implements objects which behave just like FileHandle (or IO::Handle) objects, except that you may use them to write to (or read from) an array of lines. They can be tiehandle'd as well. This is a subclass of IO::ScalarArray in which the underlying array has its data stored in a line-oriented-format: that is, every element ends in a " ", with the possible exception of the final element. This makes "getline()" much more efficient; if you plan to do line- oriented reading/printing, you want this class. The "print()" method will enforce this rule, so you can print arbitrary data to the line-array: it will break the data at newlines appropriately. See IO::ScalarArray for full usage and warnings. VERSION
$Id: Lines.pm,v 1.3 2005/02/10 21:21:53 dfs Exp $ AUTHORS
Primary Maintainer David F. Skoll (dfs@roaringpenguin.com). Principal author Eryq (eryq@zeegee.com). President, ZeeGee Software Inc (http://www.zeegee.com). Other contributors Thanks to the following individuals for their invaluable contributions (if I've forgotten or misspelled your name, please email me!): Morris M. Siegel, for his $/ patch and the new "getlines()". Doug Wilson, for the IO::Handle inheritance and automatic tie-ing. perl v5.18.2 2005-02-10 IO::Lines(3)
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