检测nginx状态，如停止可重启nginx

 如果是yum安装的nginx，请注意更换一下/etc/init.d/nginx start这段启动代码

    #!/bin/bash
    PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
    export PATH
    pgrep -x nginx &> /dev/null
    if [ $? -ne 0 ]
    then
    echo "At time:$(date) :Nginx is stop .">> /var/log/nginx_messages
    /etc/init.d/nginx start
    else
    exit
    fi