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Emacs中如何在指定目录下运行shell命令
source link: https://www.lujun9972.win/blog/2018/09/19/emacs%E4%B8%AD%E5%A6%82%E4%BD%95%E5%9C%A8%E6%8C%87%E5%AE%9A%E7%9B%AE%E5%BD%95%E4%B8%8B%E8%BF%90%E8%A1%8Cshell%E5%91%BD%E4%BB%A4/index.html
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Emacs中如何在指定目录下运行shell命令
shell-command 与 shell-comand-to-string 可以用来在Emacs中运行shell命令，这两个函数都会自动根据shell命令是否以 & 结尾来自动同步/异步调度shell命令。
这两个命令的不同点在于:
shell-command将shell命令的输出结果写入到新的buffer中shell-command-to-string则将输出结果作为字符串返回
这两个命令内部都调用 call-process,因此会将 default-directory 的值作为shell命令的工作目录(详细说明可以参见 call-process 的说明).
因此，Emacs中在指定目录下运行shell命令只需要在 let 中临时修改 default-directory 的值就行了，像这样
(let ((default-directory "/tmp")) (shell-command-to-string "pwd"))
/tmp
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