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From https://unix.stackexchange.com/a/17278/674

Local displays correspond to a socket in /tmp/.X11-unix.

(cd /tmp/.X11-unix && for x in X*; do echo ":${x#X}"; done)

On a computer:

$ (cd /tmp/.X11-unix && for x in X*; do echo ":${x#X}"; done) :0 :1 :10 :11 :2 :3 :4 :5 :6 :7 :8 :9

I was wondering how to find out the X servers (command, or pid) for the given display numbers?

Thanks.

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lsof /tmp/.X11-unix/X*

as root will list the commands and pids corresponding to each socket. You can then match the socket name to the display number, as you’ve done in your example.

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  • So you're not gonna tell me how to grep these results to get pid or command, huh? Commented Mar 15, 2019 at 14:31

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