PS1 和 PROMPT_COMMAND 有什么区别? [英] What is the difference between PS1 and PROMPT_COMMAND?

问题描述

同时查看 这个很棒的线程 我注意到有些例子使用了

While taking a look at this awesome thread I noticed that some examples use

PS1="Blah Blah Blah"

还有一些用途

PROMPT_COMMAND="Blah Blah Blah"

(有些人同时使用)在 Bash shell 中设置提示时.两者有什么区别?Stack Overflow 搜索，甚至更广泛的 Google 搜索都没有得到我的结果，因此即使是指向正确位置的链接来寻找答案也将不胜感激.

(and some use both) when setting the prompt in a Bash shell. What is the difference between the two? A Stack Overflow search and even a bit of broader Google searching aren't getting me results, so even a link to the right place to look for the answer would be appreciated.

推荐答案

来自 GNU Bash 文档页面 (Bash 参考手册):

From the GNU Bash documentation page (Bash Reference Manual):

PROMPT_COMMAND
    If set, the value is interpreted as a command to execute before
    the printing of each primary prompt ($PS1).

我从来没有用过它，但是当我只有 sh 时我可以使用它.

I never used it, but I could have used this back when I only had sh.

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