exec 的工作是将当前进程替换为一个新进程。

The job of exec is to replace the current process with a new process.

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这里的进程替换运行目录列表组件并返回一个文件名列表，后者又提供给emacs命令的参数列表。

Here the process substitution runs the directory listing components and returns a list of filenames, which is in turn supplied to the argument list of the emacs command.

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在大多数Shell环境中，您都可以使用基本的进程替换来将一个命令的输出嵌入到另一个命令的输入或参数中。

Within most shell environments, you can use basic process substitution to embed the output of one command into the input or arguments of another.

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