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Full Discussion: Need help to pick the content from Log file
Top Forums Shell Programming and Scripting Need help to pick the content from Log file Post 302783599 by Yoda on Wednesday 20th of March 2013 05:00:39 PM
Old 03-20-2013
Here is the explanation of code:
Code:
        $0 ~ P1 {               # Check if current record matches pattern: P1 (project.*3)
                f = 1           # If yes, then set flag variable f = 1
                next            # Skip processing current record
        }

        $0 ~ P2 {               # Check if current record matches pattern: P2 (project.*4)
                f = 0           # If yes, then set flag variable f = 0
                next            # Skip processing current record
        }

        f                       # If f == 1 (true) AWK's default operation is to print current record

Basically we are setting a flag variable f to 1 when first pattern is matched & we set it to 0 when second is matched, the records are printed only if the flag is set to 1.
 

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LEARN ABOUT DEBIAN

dpkg::log::analyse

DPKG::Log::Analyse(3pm) 				User Contributed Perl Documentation				   DPKG::Log::Analyse(3pm)

NAME

       DPKG::Log::Analyse - Analyse a dpkg log

VERSION

       version 1.20

SYNOPSIS

       use DPKG::Log;

       my $analyser = DPKG::Log::Analyse->new('filename' => 'dpkg.log'); $analyser->analyse;

DESCRIPTION

       This module is used to analyse a dpkg log.

METHODS

       $analser = DPKG::Log::Analyse->new('filename' => 'dpkg.log')
       $analyser = DPKG::Log::Analyse->new('log_handle' => $dpkg_log)
	   Returns a new DPKG::Log::Analyse object.  Filename parameter can be omitted, it defaults to /var/log/dpkg.log.

	   Its possible to specify an existing DPKG::Log object instead of a filename.	This will be used and overrides any filename setting.

       $analyser->analyse;
	   Analyse the debian package log.

       $analyser->newly_installed_packages
	   Return all packages which were newly installed in the dpkg.log.

       $analyser->upgraded_packages
	   Return all packages which were upgraded in the dpkg.log.

       $analyser->removed_packages
	   Return all packages which were removed in the dpkg.log.

       $analyser->unpacked_packages
	   Return all packages which are left in state 'unpacked'.

       $analyser->halfinstalled_packages
	   Return all packages which are left in state 'half-installed'.

       $analyser->halfconfigured_packages
	   Return all packages which are left in state 'half-configured'.

       $analyser->installed_and_removed_packages
	   Return all packages which got installed and removed.

SEE ALSO

       DPKG::Log, DPKG::Log::Analyse::Package

AUTHOR

       Patrick Schoenfeld <schoenfeld@debian.org>.

COPYRIGHT AND LICENSE

       Copyright (C) 2011 Patrick Schoenfeld <schoenfeld@debian.org>

       This library is free software.  You can redistribute it and/or modify it under the same terms as perl itself.

perl v5.10.1							    2011-02-26						   DPKG::Log::Analyse(3pm)
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