shell Variable

最新推荐文章于 2024-07-25 21:31:26 发布

原创最新推荐文章于 2024-07-25 21:31:26 发布 · 670 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#shell #command #filenames #variables #string

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。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

$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.