作业1：编写httpd监控脚本

#!/bin/bash
 ROOT_UID=0
if [ "$UID" -ne "$ROOT_UID" ];then
   echo "Error:you should be root to run this script!" 
      exit 1
      fi
systemctl start httpd  &>>/dev/null
 if   [ $? == 0 ];then
while true
do
        echo -e "
        \033[31m start   启动Apache服务 \033[0m 
        \033[32m stop    停止Apache服务 \033[0m 
        \033[33m restart 重启Apache服务 \033[0m 
        \033[34m status  检查Apache服务 \033[0m 
        \033[35m exit    退出执行程序   \033[0m 
                "
read -p "请输入一个您的指令："  i
case $i in
start|START)
      systemctl start httpd && echo "Apache启动成功" || echo "Apache启动失败"
      ;;
stop|STOP)
      systemctl stop httpd && echo "Apache停止成功" || echo "Apache停止失败"
      ;;
restart|RESTART)
      systemctl restart httpd && echo "Apache重启成功" || echo "Apache重启失败"
      ;;
status|STATUS)
      systemctl status httpd && echo -e `systemctl status httpd`
;;
exit|EXIT)
        exit 0
        ;;
esac
done
fi
echo "没有安装Apache服务" 
while true
do
        echo -e "
        \033[31m install   安装Apache服务 \033[0m 
        \033[32m exit      退出执行程序 \033[0m
          " 
read -p "请输入一个您的指令:" o
case $o in
install|INSTALL)
            yum install httpd -y &> /dev/null && echo "安装成功,请重新启动程序" || echo "您的yum源出现问题"
          ;;
exit|EXIT)
           exit 0
          ;;
esac
done