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Wube implemented this as part of the core game as announced in FFF-415: Multiplayer auto-pause with the release of Factorio 2.0.
Description
This mod will pause the game when the last player disconnects from the server. So the first player joining again can download the complete map and does not need to catch up.
To resume he just needs to push the "unpause" button.
Commands
There are two ingame commands (enter the in chat):
/pause
will pause the game/unpause
will unpause the game