parent.sh

#!/bin/bash

result="job.rslt"
rm $result
for var in 0 0 0
do
#  ./child.sh $var&
  ruby child.rb $var&
  mypid=$!
  echo $mypid
  echo $mypid >> $result
done

cat $result | while read line
do
  wait $line
  if [ $? ]
  then
    echo "ERROR"
  fi
done