shell script学习

1、第一个hello world

#!/bin/bashecho 'hello world'

#！/bin/bash：代表的是使用的是哪一种shell

2、变量内容由使用者决定（使用定义过的变量用在变量名前加$）

#!/bin/bashread -p "please input your firstname:" firstnameread -p "please input your lastname:" lastnameecho "\n Your full is: $firstname $lastname"

3、数字运算

#!/bin/bashread -p "first number: " firstnumread -p "second number: " secondnumtotal=$(($firstnum*$secondnum))echo "The result of $firstnum * $secondnum is $total"

运算方式：$((运算内容))