vim  test.sh

#!/bin/bash

echo "Hello World!"

 

 

#!/bin/bash

echo $0                                        //脚本的名称

echo $1                                        //第一个参数

echo $2                                        //第二个参数

echo $*                                        //所有参数

echo $#                                        //所有的综合

echo $$                                        //当前进程的进程号

echo $?                                        //上一个程序的返回状态码