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2 changes: 2 additions & 0 deletions docs/Ch06/index.md
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Expand Up @@ -969,6 +969,8 @@ Bash shell 本身提供了调试方法:

除了 Bash shell 内置的选项,还有 [BASH Debugger](http://bashdb.sourceforge.net/)、[shellcheck](https://github.com/koalaman/shellcheck) 等第三方脚本分析工具。

对于单行的命令,可以使用 [Explain Shell](https://explainshell.com/) 解释命令和参数的含义、作用。

## 思考题 {#thinking-questions}

!!! question "I/O 重定向的小细节"
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