How to print stdout & stderr of failed job in GNU parallel?

Question

I'm invoking GNU parallel on a bunch of commands using parallel --keep-order --line-buffer --halt 2. Every once in a while one of the commands fails, and GNU parallel prints:

 parallel: This job failed:

Is there any way to to print the stdout and stderr of ONLY the failed job whenever this happens?

user_363028 · Answer

neno (no-error-no-output) does that:

neno 'echo stdout; echo stderr >&2; false'
neno 'echo stdout; echo stderr >&2; true'

https://gitlab.com/ole.tange/tangetools/-/tree/master/neno

So:

parallel --halt 2 neno ...

How to print stdout & stderr of failed job in GNU parallel?

1 Answers