server - Netcat Replacement -

when creating netcat-like program how file onto server? seemed reason creating netcat-like program able use run commands, files , connect ports.

so seems it's necessary have on server in order put on server?

i'm confused.

you'd use program load initially. example, might ssh in.

it possible you'd have physical access server , install first file transfer program manually, or part of intial os install.

not interactions have done remotely. otherwise, intuition right -- we'd have chicken , egg problem.