Shell 2
#! /bin/bash
# input your comments here
echo 'Hello world' # you also can input a comment here
echo $BASH # 引用系统变量使用“$”
echo $PATH
echo the system variable path is $PATH
name=Anthony
echo my name is $name
引用系统变量使用‘$’
定义变量时等号两边不要有空格
#号是备注信息