Comment 1 for bug 1193412

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Michał Sawicz (saviq) wrote : Re: Starting unity from terminal should restart it

I believe this should be handled via an upstart session - before starting a new instance, you "stop unity8" to make sure there isn't one running, and then launch it with whatever you need.

A --replace option I don't think is wanted / needed - it only makes sense for a split display server / window manager / compositor where you want to replace the window manager in the currently running display server. With Unity8 on Mir it's all going to be the same process, so the effect is the same as killing and replacing.

Unity8 should, though, bail out if there is an instance already running.