X11 capturing DISPLAY value

[wynfield@gmail.com]

I wanted to capture the X11 DISPLAY value that shows on the console when 'startx &' in invoked and successful.  I've tried:

 startx 2>&1 | grep DISPLAY\= >/tmp/xwin.txt &
 startx 2>&1 | grep DISPLAY >/tmp/xwin.txt &

but neither worked.  I could check files in /tmp/.X11-unix/* for date, owner, etc, and hope that the newest one is the right one and extract the number from the name, however if another user started an X window in the meantime I'd get the wrong DISPLAY v
alue.

Is there a preferred standard way to get this value?

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