I do flock in the version I'm using. Should have mentioned it. Bu thanks for the heads up. Probably should also mention that I do a seek after the flock just encase the file changed while waiting for a lock:- 
  flock(OUTF,2);
  seek(OUTF,0,2);

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In reply to Re^2: Hit tracking optimization... by cosmicperl
in thread Hit tracking optimization... by cosmicperl

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