parallel_wait.sh

#!/usr/bin/env bash

#set -o xtrace
set -o errexit
set -o pipefail
set -o nounset

bin="$(cd "$(dirname "$0")" > /dev/null; pwd)"

longrunning() {
  sleep 10
  echo "done"
}

failing() {
  return 42
}

_main() {
  pids=()
  # launch long running commands which pass
  for i in $(seq 0 10); do
    longrunning &
    pids+=($!)
  done
  # launch commands which fail
  for i in $(seq 0 10); do
    failing &
    pids+=($!)
  done
  # need to loop over each pid to get wait to return the pids status
  # if the command fails, then this will cause wait to also fail (same rc) and "set -o errexit" will fail the script
  for p in "${pids[@]}"; do
    wait "$p"
  done
}

_main "$@"