multi calc outputs (reuse file IO)

[tooptoop4]

how to get 2 computations done on 1 disk read?
ie instead of sum_result=$(cat file | sum column1); crc32_result=$(cat file | crc32 column1); can both the sum and crc32 of the column be done off single disk read?

[jqnatividad]

Hi @tooptoop4 ,
Yes you can, with the luau command.

https://github.com/jqnatividad/qsv/blob/97b56c9b0ea8171987c163599e208496810d782c/src/cmd/luau.rs#L50-L51

And you can even have a full blown luau script:

https://github.com/jqnatividad/qsv/blob/97b56c9b0ea8171987c163599e208496810d782c/tests/test_luau.rs#L1608-L1696