Bash & (ampersand) operator
the best I can think of is:
first & p1=$!second & p2=$!...wait $p1 && wait $p2 && ..or
wait $p1 || ( kill $p2 $p3 && exit 1 )...however this still enforces an order for the check of processes, so if the third fails immediately you won't notice it until the first and second finishes.
This might work for you:
parallel -j3 --halt 2 <list_of_commands.txtThis will run 3 commands in parallel.
If any running job fails it will kill the remaining running jobs and then stop, returning the exit code of the failing job.
You should use && instead of &. eg:
first command && second command && third command && waitHowever this will NOT run your command in parallel as every subsequent command's execution will depend on exit code 0 of the previous command.