How to do "For now, let’s remove unnecessary files: $ rm -rf server client"?

[ghost]

This is in the first page in the WhatsApp tutorial whenever I put in "$ rm -rf server client" I get an error saying this is not an internal or external command. How would I fix this? Thanks!

[AnnotatedJS]

Try the command without the $ sign ==> rm -rf server client

[dave-happlab]

Hi i tried this without the dollar sign rm -rf server client but still got a message in command prompt saying.
C:\Windows\System32\whatsapp>rm -rf server client
'rm' is not recognized as an internal or external command,
operable program or batch file.