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I am looking for a way to list all the active VNC connection to a machine. I know I can get all the active connection of the machine by running netstat -na but I don't know how to filter just the connection for the VNC server. I am running OSX 10.8.3 , any hint?

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VNC runs on port 5900 by default, so you should be able to do:

netstat -na | grep '[:.]5900'

(OS X uses . as a port delimiter, but on Linux it's : — the pattern above will match both)

Example on my OS X machine:

% netstat -na | grep '[:.]5900'
tcp4       0      0  *.5900                 *.*                    LISTEN     
tcp6       0      0  *.5900                 *.*                    LISTEN 
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