linux中shell变量$#,$@,$0,$1,$2的含义解释

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linux中shell变量$#,$@,$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。 
$@ 
所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。 
$# 
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…。 

示例:

1 #!/bin/bash
  2 #
  3 printf "The complete list is %s\n"  "$$"
  4 printf "The complete list is %s\n"  "$!"
  5 printf "The complete list is %s\n"  "$?"
  6 printf "The complete list is %s\n"  "$*"
  7 printf "The complete list is %s\n"  "$@"
  8 printf "The complete list is %s\n"  "$#"
  9 printf "The complete list is %s\n"  "$0"
10 printf "The complete list is %s\n"  "$1"
11 printf "The complete list is %s\n"  "$2

结果:

[Aric@localhost ~]$ bash params .sh 123456 QQ
The complete list is  24249
The complete list is
The complete list is  0
The complete list is  123456 QQ
The complete list is  123456
The complete list is  QQ
The complete list is  2
The complete list is  params .sh
The complete list is  123456
The complete list is  QQ

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