Bash threaded trap runtime example

a.sh

#!/usr/bin/env bash

echo "starting a"
sleep 2
echo "completed a"

b.sh

#!/usr/bin/env bash

echo "starting b"
sleep 3
echo "completed b"

Bash-Threaded-Trap-Runtime.txt

# First time let it complete normally
$ ./wrapper.sh 
starting: 1747721582
starting b
starting a
starting c
completed c
completed a
completed b
ended: 1747721585
Runtime: 00:00:03


# This time ctrl+c out of the script before it can finish
 $ ./wrapper.sh 
starting: 1747721637
starting a
starting b
starting c
^Cended: 1747721638
Runtime: 00:00:01

c.sh

#!/usr/bin/env bash

echo "starting c"
sleep 1
echo "completed c"

wrapper.sh

#!/usr/bin/env bash

convertsecs() {
  ((h=${1}/3600))
  ((m=(${1}%3600)/60))
  ((s=${1}%60))
  printf "%02d:%02d:%02d\n" $h $m $s
}

trapfunc() {
  for pid in "${pids[@]}"; do
    kill -9 $pid 2> /dev/null
  done
  end=$(date +%s)
  echo "ended: $end"
  diff=$((end - start))
  echo "Runtime: $(convertsecs $diff)";
}
trap 'trapfunc $?; exit $?' EXIT
pids=()
start=$(date +%s)
echo "starting: $start"
./a.sh | tee output-a &
pids+=($!)
./b.sh | tee output-b &
pids+=($!)
./c.sh | tee output-c &
pids+=($!)

failed=0
for pid in "${pids[@]}"; do
  wait $pid || { failed=1; break; }
done

if [ $failed -eq 1 ]; then
  echo "A script failed while waiting."
  exit 1
fi