Combining player on the cmd line?

> What would be the proper cmdline command in order to combine players?

I guess you want to synchronize them? Please see the CLI documentation:

http://htmlpreview.github.io/?https:...s/cli-api.html

How you trigger any of those commands depends on your environment. I
recommend using JSON/RPC if you can do http POST requests. Using raw
socket (telnet style) is another option if you can't do http requests.
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Michael