测试shell

#! /bin/bash
colour () 
{ 
 #格式为背景：前景m，主要实现屏幕颜色显示 
 case $1 in
  black_white ) #背景为黑色，前景为白色 
   echo -e "\033[40;37m"
   ;; 
  black_green ) #背景为黑色，前景为绿色 
   echo -e "\033[40;32m"
   ;; 
  black_cyan ) #背景为黑色，前景为青色 
   echo -e "\033[40;36m"
   ;; 
  red_yellow ) #背景为红色，前景为黄色 
   echo -e "\033[41;33m"
   ;; 
  yellow_blue ) #背景为黄色，前景为蓝色 
   echo -e "\033[43;34m"
   ;; 
 esac 
} 

do_register()
{ 
        echo "Input ID:"
        read ID
	if grep "$ID" users.db
	then
		echo "User is already exists!
		      please Input other username:"
		do_register		
	fi
	echo "Input Password:"
	read PSW
	echo "Reinput Password:"
	read PSWt
	if [ $PSW -eq $PSWt ]
	then
		echo "$ID2 $PSW"21 >>users.db
        	echo "create success!"
	else
		echo "Two passwords are not the same!"
		echo "Register failed!"
	fi
}

do_login()
{
	echo "ID PSW:"
        read ID
        read PSW
        if grep "$ID $PSW" users.db
	then	do_Menu
	else 
		echo "login error!"
	fi
}
do_entry()
{
 echo "***************************************"
 echo "********欢迎使用学生管理系统*********"
 echo "******  1.创建用户    2.登录用户  ******"
 echo "******   （请输入选择序号）      *******"
 echo "***************************************"
 echo -e "---->您的选择：\c"
        read val
        case $val in
                1)do_register;;
                2)do_login;;
        esac
}
do_print()
{
	echo "学号 姓名 年龄 性别 电话"
	cat stu.db	
}
do_inquire()
{
	 colour black_white 
	echo "Input ID or name:"
	read x	
	if grep -w "$x" stu.db
	then	echo "学号 姓名 年龄 性别 电话"
	else
		echo "The student does not exist!"
	fi
}
do_update()
{
	colour black_cyan 
	echo "Input The Student‘s ID:"
	read ID
	if grep -w "$ID" stu.db
	then	echo "Input the updated information:"
		echo "学号 姓名 年龄 性别 电话"
		read ID name age sex phone
		echo "$ID $name $age $sex $phone" >>stu.db
		echo "Update completed!"
	else
		echo "The student does not exist!"
	fi
}
do_add()
{
	echo "Input the new student information:"
	echo "学号 姓名 年龄 性别 电话"
	read ID name age sex phone
	if [ grep -w "$id" stu.db ]
	then	echo "Students already exists!"
		echo "Please Reinput:"
		do_add
	else
		echo "$ID $name $age $sex $phone" >>stu.db
		echo "add success!"
	fi
}

do_delete()
{
	echo "Input The ID to be deleted:"
	read ID
	if grep -w "$ID" stu.db
	then	sed -i "/^$ID/d" stu.db
		echo "Delete success!"
	else
		echo "The student does not exist!"
		echo "Please Reinput:"
		do_delete
	fi
}

do_exit()
{
	echo "exit OK!"
	exit 0
}

do_Menu()
{
	 colour red_yellow 
	while true
	do
		echo "1.输出学生信息"
		echo "2.查询学生信息（按学号或名字）"
		echo "3.修改学生信息"
		echo "4.添加学生信息"
		echo "5.删除学生信息（按学号）"
		echo "6.退出系统"
		echo "Input a correct number:"
		read key
		case $key in
			1)do_print;;
			2)do_inquire;;
			3)do_update;;
			4)do_add;;
			5)do_delete;;
			6)do_exit;;
		esac
	done
}
do_entry