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How fast does it need to be ? Is a simple grep faster than looping within a script ?

grep "^M" head10000.out > M.txt
grep "^D" head10000.out > D.txt

Thanks - my general set up is OK, getting an equivalent way of placing arguments within an alias string is giving me a problem. I think I will need to convert these type of aliases to functions.

Having been a long-time csh person I now need to convert a lot of stuff to run under ksh. Can anyone tell me how to do a ksh equivalent of the csh history substitution !* that can be used in an...