src/backend/doc/dev_socket.md

Backend - dev socket

The "dev socket" allows you to interact with Puter's backend by running commands. It's a UNIX socket created in Puter's runtime directory (typically ./volatile/runtime, or /var/puter for production instances).

When in the runtime directory, you can connect to the socket with your tool of choice. For example, using nc as well as rlwrap to get readline history:

rlwrap nc -U ./dev.sock

If it is successful you will see a message with instructions. At this point you may enter a command. Enter the help command to see a list of commands.