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Re^2: Faster grep in a huge file(10 million)

by Thomas Kennll (Acolyte)
on May 10, 2013 at 20:09 UTC ( #1033020=note: print w/ replies, xml ) Need Help??


in reply to Re: Faster grep in a huge file(10 million)
in thread Faster grep in a huge file(10 million)

Thanks for the reply. I tried this but, doesn't seem to help . :(

#!/usr/bin/perl use strict; use warnings; my %file2; open my $file2, '<', '/home/match_miss' or die "Couldn't open file2: $ +!"; while ( my $line = <$file2> ) { ++$file2{$line}; } open my $file1, '<', '/home/BIG_FILE' or die "Couldn't open file1: $!" +; while ( my $line = <$file1> ) { print $line if defined $file2{$line}; }


Comment on Re^2: Faster grep in a huge file(10 million)
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Re^3: Faster grep in a huge file(10 million)
by Cristoforo (Deacon) on May 10, 2013 at 22:34 UTC
    print $line if defined $file2{$line};
    I think that finds lines in file 1 that are also in file 2. To find lines in file 1 not in file 2, maybe change that to:

    print $line unless defined $file2{$line};

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