linux中shell变量$#,[email protected],$0,$1,$2的含义

#!/bin/bash

#Created by ley on 2014-11-14

#Testing the Paramters

echo  "The compleate list is %s\n" "$$"

echo  "The compleate list is %s\n" "$!"

echo  "The compleate list is %s\n" "$?"

echo  "The compleate list is %s\n" "$*"

echo  "The compleate list is %s\n" "[email protected]"

echo  "The compleate list is %s\n" "$#"

echo  "The compleate list is %s\n" "$0"

echo  "The compleate list is %s\n" "$1"

echo  "The compleate list is %s\n" "$2"

linux中shell变量$#,[email protected],$0,$1,$2的含义解释: 
变量说明: 
$$ 
Shell本身的PID（ProcessID） 
$! 
Shell最后运行的后台Process的PID 
$? 
最后运行的命令的结束代码（返回值） 
$- 
使用Set命令设定的Flag一览 
$* 
所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。 
[email protected] 
所有参数列表。如"[email protected]"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。 
$# 
添加到Shell的参数个数 
$0 
Shell本身的文件名 
$1～$n 
添加到Shell的各参数值。$1是第1参数、$2是第2参数…。

[[email protected] ~]# ./params.sh 123456 QQ

The compleate list is %s\n 3406

The compleate list is %s\n

The compleate list is %s\n 0

The compleate list is %s\n 123456 QQ

The compleate list is %s\n 123456 QQ

The compleate list is %s\n 2

The compleate list is %s\n ./params.sh

The compleate list is %s\n 123456

The compleate list is %s\n QQ