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If your 12 million records average less than a couple of kbytes each (ie. if the size of the records file is less than your available memory), I'd just load the entire file into memory as a single string and the read the circuits file one line at a time and use index to see if it is in the records:

#! perl -slw use strict; my $records; { local( @ARGV, $/ ) = $ARGV[0]; $records = <>; } open CIRCUITS, '<', 'circuits' or die $!; while( <CIRCUITS> ) { unless( 1+ index $records, $_ ) { print; } } __END__ C:\test>1033014 records circuits >notfound

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In reply to Re: Faster grep in a huge file(10 million) by BrowserUk
in thread Faster grep in a huge file(10 million) by Thomas Kennll

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