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I'd modify olenkline's script slightly ... mainly because an odd value of hline would have split the file into three pieces!

==========Script follows ===========
#!/bin/ksh
filename=$1...

I can't thank you all enough!

I ended up going with the awk script suggested by Otheus above ... I was so amazed at the speed I felt obligated to check the result with an alternative method - and...

Thanks otheus!
Nothing quite like a one-line cryptic awk script from a guru ... with a few minor typo corrections it shows excellent promise ... trying it with the giant files and the real data is...

Heh - the grep inside the read loop would "work" ... but I'd have to come back in a year to see the results!

For tiny files this would clearly be the way to go - but for files the size I'm...

I've got file A with (say) 1M lines in it ... ascii text, space delimited ...

I've got file B with (say) 10M lines in it ... same structure.

I want to remove any lines from A that appear...