Grep matched records from huge file

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mail::mbox::messageparser::grep

Mail::Mbox::MessageParser::Grep(3)			User Contributed Perl Documentation			Mail::Mbox::MessageParser::Grep(3)

NAME

       Mail::Mbox::MessageParser::Grep - A GNU grep-based mbox folder reader

SYNOPSIS

	 #!/usr/bin/perl

	 use Mail::Mbox::MessageParser;

	 my $filename = 'mail/saved-mail';
	 my $filehandle = new FileHandle($filename);

	 my $folder_reader =
	   new Mail::Mbox::MessageParser( {
	     'file_name' => $filename,
	     'file_handle' => $filehandle,
	     'enable_grep' => 1,
	   } );

	 die $folder_reader unless ref $folder_reader;

	 # Any newlines or such before the start of the first email
	 my $prologue = $folder_reader->prologue;
	 print $prologue;

	 # This is the main loop. It's executed once for each email
	 while(!$folder_reader->end_of_file());
	 {
	   my $email = $folder_reader->read_next_email();
	   print $email;
	 }

DESCRIPTION

       This module implements a GNU grep-based mbox folder reader. It can only be used when GNU grep is installed on the system. Users must not
       instantiate this class directly--use Mail::Mbox::MessageParser instead. The base MessageParser module will automatically manage the use of
       grep and non-grep implementations.

   METHODS AND FUNCTIONS
       The following methods and functions are specific to the Mail::Mbox::MessageParser::Grep package. For additional inherited ones, see the
       Mail::Mbox::MessageParser documentation.

       $ref = new( { 'file_name' => <mailbox file name>, 'file_handle' => <mailbox file handle> });
	       <file_name> - The full filename of the mailbox
	       <file_handle> - An opened file handle for the mailbox

	   The constructor for the class takes two parameters. The file_name parameter is the filename of the mailbox. The file_handle argument is
	   the opened file handle to the mailbox.

	   Returns a reference to a Mail::Mbox::MessageParser object, or a string describing the error.

BUGS

       No known bugs.

       Contact david@coppit.org for bug reports and suggestions.

AUTHOR

       David Coppit <david@coppit.org>.

LICENSE

       This software is distributed under the terms of the GPL. See the file "LICENSE" for more information.

HISTORY

       This code was originally part of the grepmail distribution. See http://grepmail.sf.net/ for previous versions of grepmail which included
       early versions of this code.

SEE ALSO

       Mail::Mbox::MessageParser

perl v5.12.1							    2009-08-09					Mail::Mbox::MessageParser::Grep(3)

Shell Programming and Scripting