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[racket] Call racket from racket on MacOSX, no response

From: Niitsuma Hirotaka (hirotaka.niitsuma at gmail.com)
Date: Tue Jul 26 12:54:06 EDT 2011		 
The following code works on linux.
But on MacOSX, no response
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#lang racket
(require racket/system)
(display (port->string (car (process     "racket -e '(+ 10 3)'"))))
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However this works on MacOSX
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#lang racket
(require racket/system)
(display (port->string (car (process "ls'"))))
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