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How do I get the first unused X display in either Python (Don't think there's a way) or {,ba,z}sh? It could return <number>, :<number>, or $(hostname):<number>).

For example:

  • X session at :0, 1 returned.
  • X session at :0, VNC at :1, 2 returned.
  • X session at :0, QEMU at :2, 1 returned.
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There is no good way. The least bad way I am aware of is to inspect the contents of /tmp/.X11-unix; this will contain Unix domain sockets named X0 for :0, X1 for :1, and so on. If you want a TCP socket instead, attempt to connect to port 6000 and up until you get ECONNREFUSED. Beware that both of these approaches have inherent race conditions which are AFAIK unfixable.

于 2013-07-30T02:39:08.013 回答