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Is there a command line tool that allows you to adjust the settings for a running X session?

For example, the equivalent for pulseaudio would be the pacmd command line utility which allows you to add/edit/delete audio devices.

I'm asking because I've got a setup using Xdmx connecting several networked screens together, and I would like to know if theres a way to add and remove screens without too much effort

Thanks in advance.

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Try the xrandr command.

Here's some extra content just to get past the stupid 30-character minimum for posting.

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cheers; turns out it doesn't support work with Xdmx but it's pointed me in the right direction :) I'll leave the question open for a couple of days to see if anyone else answers but thanks :D –  jackweirdy May 27 '12 at 12:27

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