update

#! /bin/sh
#2018年1月30日15：00写
#原来就三行
#结果对它的运行结果不太满意，于是并便改造了一下。
#在网上百度了一下if的用法和脚本的参数
#写出了我的第一个具有完整功能的shell脚本
if [ "$#" -eq "1" ];then 
	if [ "$1" == "--no-reboot" ];then 
		yum update kernel -y 
		yum update -y 
	else if [ "$1" == "--normal" ];then 
		yum update kernel -y 
		yum update -y 
		init 6 
		else if [ "$1" == "--help" ];then
			echo "                  help" 
			echo " --normal :Update and reboot."
			echo " --no-reboot :Update but Don't reboot."
			echo " --help :Get help"
			echo " --about :About this Program."
			
			else if [ "$1" == "--about" ];then
				echo "              Update Helper"
				echo "               Version 1.0"
				echo "             Made by Mr. Lv"
				echo "   Compliance with the GPL V3 protocol."
				echo "    http://www.gnu.org/licenses/gpl.txt"
				else 
					echo "                  help" 
					echo " --normal :Update and reboot."
					echo " --no-reboot :Update but Don't reboot."
					echo " --help :Get help"
					echo " --about :About this Program."
			fi
		fi
	fi
fi
else
echo "                  Usage:"
#echo "           update --no-reboot"
#echo "           update --normal"
#echo "              update --help"
echo "            update --[Option]"
echo "            E.g:update --help"
fi