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Full Discussion: Match text to lines in a file, iterate backwards until text or text substring matches, print to file
Top Forums Shell Programming and Scripting Match text to lines in a file, iterate backwards until text or text substring matches, print to file Post 303038410 by Chubler_XL on Tuesday 3rd of September 2019 12:07:41 AM
Old 09-03-2019
shogun1970

Apart from showing us your attempts at this problem, could you also indicate if the order of records in the output file is important?

The problem description seems to indicate that a direct match record, when available, should be listed first and then other matches should be displayed in the same order as they appear in file1.txt.

However if the order of records in the output file is unimportant, the solution can be simplified a fair bit.
 

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LEARN ABOUT MOJAVE

net::dns::rr::lp5.18

Net::DNS::RR::LP(3)					User Contributed Perl Documentation				       Net::DNS::RR::LP(3)

NAME

       Net::DNS::RR::LP - DNS LP resource record

SYNOPSIS

	   use Net::DNS;
	   $rr = new Net::DNS::RR('name IN LP preference locator');

	   $rr = new Net::DNS::RR(
	       name	  => 'example.com',
	       type	  => 'LP',
	       preference => 10,
	       locator	  => 'locator.example.com'
	       );

DESCRIPTION

       Class for DNS Locator Pointer (LP) resource records.

       The LP DNS resource record (RR) is used to hold the name of a subnetwork for ILNP.  The name is an FQDN which can then be used to look up
       L32 or L64 records.  LP is, effectively, a Locator Pointer to L32 and/or L64 records.

METHODS

       The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

       Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or
       other unpredictable behaviour.

   preference
	   $preference = $rr->preference;

       A 16 bit unsigned integer in network byte order that indicates the relative preference for this LP record among other LP records associated
       with this owner name.  Lower values are preferred over higher values.

   locator
	   $locator = $rr->locator;

       The Locator field contains the DNS target name that is used to reference L32 and/or L64 records.

COPYRIGHT

       Copyright (c)2012 Dick Franks.

       Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

       All rights reserved.

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       perl, Net::DNS, Net::DNS::RR, RFC6742

perl v5.18.2							    2014-01-16						       Net::DNS::RR::LP(3)
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