进程退出后自动重启脚步

#!/bin/sh
while true;
do
processExist=`ps aux | grep xxx | grep -v "grep" `
if [ -z "$processExist" ];then
  echo "proecss is restarted"
  cd /MyData/xxx
  nohup sh xxx.sh &
else
  echo "process is running"
fi
sleep 60
done