如果您在整个工作日访问多个服务器，那么能够根据配色方案一眼就知道您使用的是哪一个服务器是非常有用的。今天的超级用户问答帖子帮助读者在工作环境中实现多彩的涅盘。

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问题

超级用户读者nitins想知道如何使Bash提示符在登录到服务器时更改颜色：

Is there a way to make the Bash Prompt dynamic so that it changes color when I am logged into a server? I want the color to be green when using my own personal system, but change to red whenever I am connected to servers. I have a huge number of servers that I access and do not want to have to put a different .bashrc on each and every one of them.

如何使Bash提示符在登录到服务器时更改颜色？

答案

超级用户贡献者Matei David为我们提供了答案：

Remote Bash Prompts are set by the remote ~/.bashrc, so you will still need to copy it to the remote servers. However, you can use a single ~/.bashrc for all hosts and set the Bash Prompt color based on the host name:

Notes

• Do not set PS1 if it is not already set (i.e. if the shell is not interactive). Testing to see if PS1 is “non-empty” is a very common way to find out if the shell is interactive and you do not want to confuse programs that do that (arguably, a more accurate test is checking to see if $- contains i).
• If you want this code to run when logging into a remote server, you should have one of the profile files always source ~/.bashrc (I am assuming you know that).
• In PS1, the escape codes must be enclosed in \[…\].
• \[033[m resets the foreground and background to their defaults, so here :\w appears in the terminal foreground/background.
• \[033[48;5;XXXm\033[38;5;YYYm sets the background/foreground to XXX/YYY.
• For a script that dumps the available colors, try colortest.
• To check and see what the Bash Prompt would look like, use: echo -e “<\033[48;5;16m\033[38;5;196mhost\033[m:dir>$ “

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