监控apache的shell脚本

#!/bin/bash              
service httpd status|grep "run">/dev/null          查看apache服务的状态并不显示
if [ $? -eq 0 ];then                                                     如果上面命令执行成功的话
echo httpd is running.                                              显示“httpd is running. ”
else                                                                                否则
echo httpd is down,and starting....                        显示“httpd is down,and starting.... ”
service httpd start>/dev/null 2> /dev/null             启动apache服务并不显示信息
sleep 2s                                                                         停留2s
echo httpd is running.                                              显示“httpd is running.   ”
fi