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Top Forums UNIX for Dummies Questions & Answers extracting selected few lines through perl Post 302213264 by tinivole on Wednesday 9th of July 2008 05:28:51 PM
Old 07-09-2008
a2p and s2p

Hi, so far as I know, there isn't any truly easy way to do this in Perl in quite the same way that awk and sed provides.

But there are two Perl apps that will convert awk and sed code into Perl for you, so you can perhaps learn from them instead.

The first being a2p (awk to perl) and the second being s2p (sed to perl)

To answer one of your example questions, you can emulate "head" in sed with the command:
Code:
sed 10q

So, to convert that into Perl code and save it to a file for reading. The command:
Code:
s2p 10q > head.pl

Would acheive that.

Although, I did say that there isn't any truly easy way in Perl, and you may be quite blown by the output of that command.

Regards
Iain
 

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Mail::Message::Construct::Text(3pm)			User Contributed Perl Documentation		       Mail::Message::Construct::Text(3pm)

NAME
Mail::Message::Construct::Text - capture a Mail::Message as text SYNOPSIS
my $text = $msg->string; my $text = "$msg"; # via overload my @text = $msg->lines; my @text = @$lines; # via overload my $fh = $msg->file; my $line = <$fh>; $msg->printStructure; DESCRIPTION
Complex functionality on Mail::Message objects is implemented in different files which are autoloaded. This file implements the functionality related to creating message replies. METHODS
The whole message as text $obj->file() Returns the message as file-handle. $obj->lines() Returns the whole message as set of lines. In LIST context, copies of the lines are returned. In SCALAR context, a reference to an array of lines is returned. $obj->printStructure([FILEHANDLE|undef],[INDENT]) Print the structure of a message to the specified FILEHANDLE or the selected filehandle. When explicitly "undef" is specified as handle, then the output will be returned as string. The message's subject and the types of all composing parts are displayed. INDENT specifies the initial indentation string: it is added in front of each line. The INDENT must contain at least one white-space. example: my $msg = ...; $msg->printStructure(*OUTPUT); $msg->printStructure; my $struct = $msg->printStructure(undef); # Possible output for one message: multipart/mixed: forwarded message from Pietje Puk (1550 bytes) text/plain (164 bytes) message/rfc822 (1043 bytes) multipart/alternative: A multipart alternative (942 bytes) text/plain (148 bytes, deleted) text/html (358 bytes) $obj->string() Returns the whole message as string. Flags SEE ALSO
This module is part of Mail-Box distribution version 2.105, built on May 07, 2012. Website: http://perl.overmeer.net/mailbox/ LICENSE
Copyrights 2001-2012 by [Mark Overmeer]. For other contributors see ChangeLog. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html perl v5.14.2 2012-05-07 Mail::Message::Construct::Text(3pm)
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