shell脚本监控httpd进程，如果进程异常自动重启服务

time=10
while true;do
    if killall -0 httpd &> /dev/null ;then
            :
        else
            /usr/local/apache2/bin/httpd -k restart  &> /dev/null
                echo `date "+%F %T"` restart httpd >> /data/httpd.log
        fi
        sleep $time
done