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thank you for this. any additional ideas on how to make what i have in my original post more efficient?

i read somewhere that i can "pipe" the functions, but i haven't seen an example on how to...

so i've been using this a lot in a lot of my scripts:

( columnA & columnAPID=$! & columnB & columnBPID=$! & columnC & columnCPID=$! &) &
wait ${columnAPID}
wait ${columnBPID}
wait ${columnCPID}...