转自：http://www.cnblogs.com/fhefh/archive/2011/04/15/2017613.html
linux中shell变量$#,$@,$0,$1,$2的含义解释:
变量说明:
$$
Shell本身的PID（ProcessID）
$!
Shell最后运行的后台Process的PID
$?
最后运行的命令的结束代码（返回值）
$-
使用Set命令设定的Flag一览
$*
所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。
$@
所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。
$#
添加到Shell的参数个数
$0
Shell本身的文件名
$1～$n
添加到Shell的各参数值。$1是第1参数、$2是第2参数…。
1 #!/bin/bash 2 # 3 printf "The complete list is %s " "$$" 4 printf "The complete list is %s " "$!" 5 printf "The complete list is %s " "$?" 6 printf "The complete list is %s " "$*" 7 printf "The complete list is %s " "$@" 8 printf "The complete list is %s " "$#" 9 printf "The complete list is %s " "$0" 10 printf "The complete list is %s " "$1" 11 printf "The complete list is %s " "$2 结果： [Aric@localhost ~]$ 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