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This is a question about X Windows support for Mac.

I sometimes ssh to a Linux computer, and start software there.

The software requires graphical interface (a DISPLAY).

I am curious whether it is possible to direct all graphical output from the Linux machine to my local Mac computer that I use for sshing to the Linux machine.

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You can X-tunnel over ssh on a mac; OS X machines all have an X server installed by default. You need to use the command ssh -X [hostname] to enable the X-tunnel, and then start the program via the shell. Typically, you do not need to specify your local display; the program should display locally automatically.

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This might also need X11Forwarding yes in sshd_config on your Linux box. – Arjan Oct 24 '10 at 16:53
Some servers will only allow trusted connections, if so use ssh -Y. (or put ForwardX11Trusted Yes into ~/ssh/config for this host) – Doug Harris Oct 27 '10 at 19:45

Yes, yes it is. According to Apple it is optional but installed by default. There's also Xquartz

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