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c:\test>for /l %i in (1,1,50) do @jun
STOP: Tue May 19 12:18:20 2009
...
  64000 out.txt
STOP: Tue May 19 12:18:57 2009
  64000 out.txt

NAME
       dup, dup2 - duplicate a file descriptor
...

       After successful return of dup or dup2, the old and new descrip
+tors may
       be used interchangeably.

       The two descriptors do not share the close-on-exec flag, howeve
+r.