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Top Forums Shell Programming and Scripting Filter uniq field values (non-substring) Post 302900881 by vgersh99 on Friday 9th of May 2014 09:38:11 AM
Old 05-09-2014
no-no, this is all good - no ill feelings here!
I see your point - and yes, we solved this case earlier - I need to revert to my previous code:
Code:
awk '{
      for(i=1;i<=c;i++) {
        if (!(i in a)) continue
        if (index(a[i],$2) && index(b[i],$4))
           next

        if (index($2, a[i]) && index($4,b[i])) {
           delete a[i]
           delete b[i]
           delete all[i]
        }
      }

      a[++c]=$2
      b[c]=$4
      all[c]=$0
   }
END {
   for (i=1; i<=c;i++) if (i in all) print all[i]
}' myFile

It's a bit ugly. If you have an improvement idea, I'd be grateful to see it as well.
Also I cannot think of an easy non-convoluted way to avoid a full scan of the already cached entries for every new record/line (in order to improve the performance)...

Thanks for staying on this thread!

Last edited by vgersh99; 05-09-2014 at 10:54 AM..
These 2 Users Gave Thanks to vgersh99 For This Post:
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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