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Anonymous Monk
Thank you very much indeed! This is what I was after and so simple when you think about it! Greg.
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PS to the others making suggestions about how to schedule multiple jobs etc, your suggestions are good in theory but the problem is more complicated than I outlined and pre-scanning at the beginning does not work in practice (for reasons including load-balancing due to different processing time (as mentioned) , the fact that the files that are available to process can change, that I often have to kill off jobs when other people want to use the cluster, etc, etc).
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