Writing a shell script--writing a simple script

1. Simple script file hello.sh, the content is as follows

#!/bin/bashpwdls-al

Execute script: Bash hello.sh or use the root command:./hello.sh

2. Accept user Parameters

The name of the script file executed by $ A

$* on behalf of all user parameters

$? Represents the return value after the last command was executed

$ #代表总共多少个参数

$n represents the value of the first parameter, n represents the first parameter,

　　

Execution: Bash params.sh

Writing a shell script--writing a simple script