Add xrandr post.

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+[xrandr][] is a simple command line interface to X's [RandR][]
+extension, allowing you to manipulate the root window and map it onto
+different devices.  I use it to switch between my laptop's builtin LCD
+screen and external monitors when I'm giving presentations, or when
+I'm at home and just want to take advantage of a larger display.
+
+You can get a list of available devices with
+
+    $ xrandr
+    Screen 0: minimum 320 x 200, current 800 x 480, maximum 4096 x 4096
+    LVDS1 connected 800x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
+       800x480        60.6*+
+       640x480        85.0     72.8     75.0     59.9  
+       720x400        85.0  
+       640x400        85.1  
+       640x350        85.1  
+    VGA1 disconnected (normal left inverted right x axis y axis)
+    TV1 disconnected (normal left inverted right x axis y axis)
+
+Once I've plugged an external monitor into the VGA port on my laptop, I get
+
+    $ xrandr
+    Screen 0: minimum 320 x 200, current 800 x 480, maximum 4096 x 4096
+    LVDS1 connected 800x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
+       800x480        60.6*+
+       640x480        85.0     72.8     75.0     59.9  
+       720x400        85.0  
+       640x400        85.1  
+       640x350        85.1  
+    VGA1 connected (normal left inverted right x axis y axis)
+       1280x1024      60.0 +   75.0  
+       1152x864       75.0  
+       1024x768       85.0     75.1     60.0  
+       832x624        74.6  
+       800x600        85.1     75.0     60.3  
+       640x480        85.0     75.0     60.0  
+       720x400        70.1  
+    TV1 disconnected (normal left inverted right x axis y axis)
+
+Shift output to the external monitor at its full resolution with
+
+    $ xrandr --fb 1280x1024 --output VGA1 --auto
+    $ xrandr --output LVDS1 --off
+
+When you're done, shift it back with
+
+    $ xrandr --fb 800x480 --output LVDS1 --auto
+    $ xrandr --output VGA1 --off
+
+If you want to split your screen across both monitors, use something like
+
+    $  xrandr --output VGA1 --auto --right-of LVDS
+
+For more information, check out the excellent [tutorial at
+ThinkWiki][tutorial].
+
+[xrandr]: http://www.x.org/wiki/Projects/XRandR
+[RandR]: http://en.wikipedia.org/wiki/RandR
+[tutorial]: http://www.thinkwiki.org/wiki/Xorg_RandR_1.2
+
+[[!tag tags/linux]]