[Shell Learning] Special variables on the third day

Language 2024-01-09 00:15:34 views: null

special variables

$n

$n：n为数字，$0代表该脚本名称，$1-$9代表第一到第九个参数，十以上的参数需要用大括号，如${10}

$0：脚本的名称
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$1：执行脚本时命令里对应的参数

$#

$#：获取所有输入参数的个数
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$*

代表命令行中所有的参数，把所有的参数看成一个整体
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$@

代表命令行中所有的参数，把每个参数区分对待
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$?

$?：最后一次执行的命令的返回状态。0表示上一次成功，否则失败
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Origin blog.csdn.net/weixin_46318413/article/details/129500869

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