Hi,

If this is the only thing you want to do, I would use bash

for i in *did; do [ ! -f ${i%\.did}.mrg ] && echo $i; done
[download]

(Don't take this post to serious, I would -of course- go for perl if I need to do more than just display the files)
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Dr. Mark Ceulemans
Senior Consultant
BMC, Belgium