linux中shell变量$#,$@,$0,$1,$2的含义解释:
变量说明:
$$
Shell本身的PID（ProcessID）
$!
Shell最后运行的后台Process的PID
$?
最后运行的命令的结束代码（返回值）
$-
使用Set命令设定的Flag一览
$*
所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。
$@
所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。
$#
添加到Shell的参数个数
$0
Shell本身的文件名
$1～$n
添加到Shell的各参数值。$1是第1参数、$2是第2参数…。
示例：
#!/bin/bash
printf "The complete list is %s\n" "$$"
printf "The complete list is %s\n" "$!"
printf "The complete list is %s\n" "$?"
printf "The complete list is %s\n" "$*"
printf "The complete list is %s\n" "$@"
printf "The complete list is %s\n" "$#"
printf "The complete list is %s\n" "$0"
printf "The complete list is %s\n" "$1"
printf "The complete list is %s\n" "$2"
bash tmp.sh 1 2
The complete list is 3599 The complete list is The complete list is 0 The complete list is 1 2 The complete list is 1 The complete list is 2 The complete list is 2 The complete list is tmp.sh The complete list is 1 The complete list is 2
注意标红的部分
参考：http://www.cnblogs.com/fhefh/archive/2011/04/15/2017613.html
linu shell $#,$@,$0,$1,$2的含义解释
原文：http://www.cnblogs.com/stsjiayou/p/4357897.html