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bash里的特殊变量

2012-12-19 14:24:31| 分类： shell | 标签： |举报 |字号大中小订阅

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变量名	含义
$0	shell或shell脚本的名字
$*	以一对双引号给出参数列表
$@	将各个参数分别加双引号返回
$#	参数的个数
$_	代表上一个命令的最后一个参数
$$	代表所在命令的PID
$!	代表最后执行的后台命令的PID
$?	代表上一个命令执行后的退出状态
$N	N为0或者正整数，当N为0的时候，获得bash脚本名，否则将获得第N个参数的值

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