(I'm a teapot) How to make the command perform actions when you enter a certain character?

Question

Command line

Decided to make a text game in IDLE. And I have 2 questions. How to make the command perform actions when entering a certain character?
And the second is about the combat system. Just give me some tips for getting started, if it doesn't work, then I'll abandon it

Answer 1

@SET /P Inp="Command: "
@IF /I %Inp%==K ECHO Command for K