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Top Forums UNIX for Dummies Questions & Answers Grep char count & pipe to sed command Post 302419154 by cavanac2 on Thursday 6th of May 2010 11:32:01 AM
Old 05-06-2010
Grep char count & pipe to sed command

Hi
I am having a 'grep' headache
Here is the contents of my file:

(PBZ,CP,(((ME,PBZ,BtM),ON),((ME,((PBZ,DG),(CW9,PG11))),CW9,TS2,RT1)))

I would like to count out how many times 'PBZ' occurs and then place that number in the line above

3
(PBZ,CP,(((ME,PBZ,BtM),ON),((ME,((PBZ,DG),(CW9,PG11))),CW9,TS2,RT1)))


This is how i am doing so far on my code
Code:
grep 'PBZ' FileIn | wc -c | while read i;
do sed '1i\ 
$i' FileIn > Fileout
done

This is what i get for my Fileout
$i(PBZ,CP,(((ME,PBZ,BtM),ON),((ME,((PBZ,DG),(CW9,PG11))),CW9,TS2,RT1)))


I know that there are three main problems here

1) grep 'PBZ' FileIn | wc -c = 70 .... it is counting every character instead of just counting all the 'PBZ'
2) When i do my while read i command, it does not carry the count over to my sed command thus my $i was not changed in my code
3) The $i is being placed before, but on the same line as my string, i would like it to be on a separate line above my string.

If anyone has any suggestions or tips on how i could correct this it would be very much appriciated.Smilie
 

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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)
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