# run processes and store pids in array

for i in $n_procs; do

    ./procs[${i}] &

    pids[${i}]=$!

done

​

# wait for all pids

for pid in ${pids[*]}; do

    wait $pid

done

#!/bin/bash

trap 'killall' INT

​

killall() {

    trap '' INT TERM     # ignore INT and TERM while shutting down

    echo "**** Shutting down... ****"     # added double quotes

    kill -TERM 0         # fixed order, send TERM not INT

    wait

    echo DONE

}

​

./process1 &

./process2 &

./process3 &

​

cat # wait forever

$ sleep 20 && true || tee fail &

$ sleep 20 && false || tee fail &

$ wait < <(jobs -p)

$ test -f fail && echo Calculation failed.

#! /bin/bash

​

items="1 2 3 4 5 6"

pids=""

​

for item in $items; do

    sleep $item &

    pids+="$! "

done

​

for pid in $pids; do

    wait $pid

    if [ $? -eq 0 ]; then

        echo "SUCCESS - Job $pid exited with a status of $?"

    else

        echo "FAILED - Job $pid exited with a status of $?"

    fi

done

#!/bin/bash

for i in $(seq 0 9); do

   (doCalculations $i >&2 & wait %1; echo $?) &

done | grep -qv 0 && exit 1

pids=""

for t in 3 5 4; do 

  sleep "$t" &

  pids="$pids $!"

done

waitall $pids