Sounds like a webservice with a REST API. Every non-Windows computer comes with a client out of the box.
In fact, for some of these things, I think I've seen REST APIs in existence, for the text and image conversion ones. The imagined "ru" command could just be a function or alias to curl/wget.
In fact, for some of these things, I think I've seen REST APIs in existence, for the text and image conversion ones. The imagined "ru" command could just be a function or alias to curl/wget.