Delete flow to restart node-red

How can i delete my flow in raspberry terminal?
Than maybe i can restart node-red and start over.

Do you mean you want to start again with a completely empty flow? If so then all you need to do is to delete the flow file and restart node-red. The startup log tells you where the flows file is if you don't know. Usually ~/.node-red/flows_hostname.json

found it . thx