#!/bin/bash

function tool_menu()
{
   echo "****************************************************"
   echo "*                                                 *"
   echo "*             calculation tools                 *"
   echo "*                                                 *"
   echo "****************************************************"
}
function menu_choice()
{
   echo "A: Add two num."
   echo "B: Minus two num."
   echo "C: Multiply two num."
   echo "D：Divide two num."
   echo "Q: Close this function."
   echo "Please input your chiose:"
}
function add_num()
{
   echo "please inut your first num:"
   read first_num
   echo "please inut your second num:"
   read second_num
   let add=$first_num+$second_num
   echo "$first_num+$second_num=$add"
   return 0
}
function minus_num()
{
   echo "please inut your first num:"
   read first_num
   echo "please inut your second num:"
   read second_num
   let minus=$first_num-$second_num
   echo "$first_num-$second_num=$minus"
   return 0
}
function multiply_num()
{
   echo "please inut your first num:"
   read first_num
   echo "please inut your second num:"
   read second_num
   let multiply=$first_num*$second_num
   echo "$first_num*$second_num=$multiply"
   return 0
}

function divide_num()
{
   echo "please inut your first num:"
   read first_num
   echo "please inut your second num:"
   read second_num
   let divide=$first_num/$second_num
   echo "$first_num/$second_num=$divide"
   return 0
}
function main()
{
   clear
   tool_menu
   while :
   do
       menu_choice
       read menu_choice
       case $menu_choice in
           A|a) add_num ;;
           B|b) minus_num ;;
           C|c) multiply_num ;;
           D|d) divide_num ;;
           Q|q) break;;
           *) echo "Input error,please try agin.";;
       esac
   done
}
main
exit 0

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 模板
#!/bin/bash

function tool_menu()
{
   echo "****************************************************"
   echo "*                                                 *"
   echo "*             calculation tools                 *"
   echo "*                                                 *"
   echo "****************************************************"
}
function menu_choice()
{
   echo "A: Add two num."
   echo "B: Minus two num."
   echo "C: Multiply two num."
   echo "D：Divide two num."
   echo "Q: Close this function."
   echo "Please input your chiose:"
}
function add_num()
{

   echo "add."
}
function minus_num()
{

   echo "minus."
}
function multiply_num()
{
   echo "multiply."

}

function divide_num()
{

   echo "divide."

}
function main()
{
   clear 模板

   tool_menu
   while :
   do
       menu_choice
       read menu_choice
       case $menu_choice in
           A|a) add_num ;;
           B|b) minus_num ;;
           C|c) multiply_num ;;
           D|d) divide_num ;;
           Q|q) break;;
           *) echo "Input error,please try agin.";;
       esac
   done
}
main
exit 0

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文章名称：shell简单计算器-创新互联
文章来源：http://cdweb.net/article/dhhcss.html