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gnu-parallel

GNU parallel sorted stdout and stderr

I've been using GNU parallel and I want to keep output order (--kepp-order), grouped by jobs (--grouped) but also with sorted stdout and stderr. Right now, the grouped options first print stdout and only after does it print stderr.

As an example, any way that these two commands give the same output?

seq 4 | parallel -j0 'sleep {}; echo -n start{}>&2; sleep {}; echo {}end'

seq 4 | parallel -j0 'sleep {}; echo -n start{}   ; sleep {}; echo {}end'

thanks,

Solution

  • You cannot do that if you still want stderr and stdout to be separated.

    The reason for this is that stderr and stdout are buffered to 2 different files using buffered output.

    But maybe you can explain a bit more on what you need this for. In that case there might be a solution.