当您打开终端时，您会看到一个提示符，它看起来一般是这个样子的： missing:~$ 这是 shell 最主要的文本接口。它告诉你，你的主机名是 missing 并且您当 前的工作目录（”current working directory”）或者说您当前所在的位置 是 ~ (表示 “home”)。
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cohert - (no access) - 课程概览与 shell · the missing semester of your cs education.pdf, p2
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