核心代码：

#/bin/bash
set -x
HOSTS="nginx mysql php-cgi"
for myhost in $HOSTS
  do
  count=(`ps aux |grep $myhost |grep -v grep |wc -l`)
  echo "$myhost"
  echo "$count"
if [ $count -eq 0 ]; then
  case $myhost in
  nginx) 
  cd /usr/local/webserver/nginx/sbin/
  ./nginx
  echo "nginx has be down"
  sleep 5

  mysql)
  /etc/init.d/mysqld start
  echo "mysql has be down"

  *) 
  echo "what‘s the hell?"

esac
  fi
done
set +x