shell Variable

最新推荐文章于 2024-07-25 21:31:26 发布

A_Lost_Gymnosophist

最新推荐文章于 2024-07-25 21:31:26 发布

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文章标签： shell command filenames variables string

本文链接：https://blog.youkuaiyun.com/chengenbao/article/details/6020754

本文详细介绍了Shell脚本中常用的特殊变量，包括$0到$9等，解释了它们各自的功能及应用场景，例如$0代表当前执行命令的名字，$?用于获取上一条命令的退出状态等。

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$1 - $9       these variables are the positional parameters.

$0            the name of the command currently being executed.

$#            the number of positional arguments given to this
              invocation of the shell.

$?            the exit status of the last command executed is
              given as a decimal string.  When a command
              completes successfully, it returns the exit status
              of 0 (zero), otherwise it returns a non-zero exit
              status.

$$            the process number of this shell - useful for
              including in filenames, to make them unique.

$!            the process id of the last command run in
              the background.

$-            the current options supplied to this invocation
              of the shell.

$*            a string containing all the arguments to the
              shell, starting at $1.

$@            same as above, except when quoted.