How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess ends with code !=0?

Question

How to wait in a bash script for several subprocesses spawned from that script to finish and return exit code !=0 when any of the subprocesses ends with code !=0 ?

S

Answer 1

If you have GNU Parallel installed you can do:

# If doCalculations is a function
export -f doCalculations
seq 0 9 | parallel doCalculations {}

GNU Parallel will give you exit code:

• 0 - All jobs ran without error.

• 1-253 - Some of the jobs failed. The exit status gives the number of failed jobs

• 254 - More than 253 jobs failed.

• 255 - Other error.

Watch the intro videos to learn more: http://pi.dk/1