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Full Discussion: Efficient way to search array in text file by awk
Top Forums Shell Programming and Scripting Efficient way to search array in text file by awk Post 302958734 by Don Cragun on Monday 26th of October 2015 04:14:12 AM
Old 10-26-2015
Hi siramitsharma,
Forum rules prohibit sending private message asking people to respond to your posts.

Note that with the two lines in SPLNO.TXT:
Code:
918542054921|30|1|2
854215595|12|1|2

any of the following lines in MDN.TXT:
Code:
918542054921
91854205492
9185420549
918542054
91854205
9185420
918542
91854
9185
918
91
9
8542054921
854205492
85420549
8542054
854205
85420
8542
854
85
8

would match the 1st line. And any of the following lines in MDN.TXT:
Code:
854215595
85421559
8542155
854215
85421
8542
854
85
8

would match the 2nd line.
So maybe you could pre-build a table of the values that could match entries from the first file and instead of performing lots of matches and comparisons in a loop, you could just test if((mdn in table) || ("91"mdn in table)) instead of the four slower tests you are current using to see if there is a match.

Since every entry in the input has the final two fields with the values 1 and 2, respectively, all we need to know is whether or not there is a match; not what values appear if there is a match. This is important because both entries above match lines in MDN.TXT containing the values:
Code:
8542
854
85
8

You also need to explain why the 2nd field in the 1st line above has the value 30. Since field 1 is 12 characters (918542054921), the longest possible string that can be matched is 12 characters. And, on the 2nd line we have a 1st field (854215595) with length 9 and a second field containing 12. So, I repeat, what use is the 2nd field in SPLNO.TXT other than to give you two more tests to slow down your loop?
 

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LEARN ABOUT MOJAVE

net::dns::rr::txt5.18

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

NAME

       Net::DNS::RR::TXT - DNS TXT resource record

SYNOPSIS

	   use Net::DNS;
	   $rr = new Net::DNS::RR( 'name TXT  txtdata ...' );

	   $rr = new Net::DNS::RR( name    => 'name',
				   type    => 'TXT',
				   txtdata => 'single text string'
				   );

	   $rr = new Net::DNS::RR( name    => 'name',
				   type    => 'TXT',
				   txtdata => [ 'multiple', 'strings', ... ]
				   );

	   use utf8;
	   $rr = new Net::DNS::RR( 'jp TXT    XXXXXXXXXXXX' );

DESCRIPTION

       Class for DNS Text (TXT) resource 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.

   txtdata
	   $string = $rr->txtdata;
	   @list   = $rr->txtdata;

	   $rr->txtdata( @list );

       When invoked in scalar context, txtdata() returns the descriptive text as a single string, regardless of the number of elements.

       In a list context, txtdata() returns a list of the text elements.

COPYRIGHT

       Copyright (c)2011 Dick Franks.

       All rights reserved.

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

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

SEE ALSO

       perl, Net::DNS, Net::DNS::RR, RFC1035 Section 3.3.14, RFC3629

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