通过修改环境变量控制 cmd 提示符。
ref
cmd - How do I change the command-line prompt in Windows? - Stack Overflow
https://stackoverflow.com/questions/12028372/how-do-i-change-the-command-line-prompt-in-windows
A better PROMPT for CMD.EXE or Cool Prompt Environment Variables and a nice transparent multi-prompt - Scott Hanselman's Blog
https://www.hanselman.com/blog/a-better-prompt-for-cmdexe-or-cool-prompt-environment-variables-and-a-nice-transparent-multiprompt