-u option for fileread

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# 1  
Old 12-21-2007
-u option for fileread

Can any one pls tell me how the -u option for read works?
# 2  
Old 12-21-2007
from "man read" :
-u fd :
Read input from file descriptor fd.
If no names are supplied, the line read is assigned to the variable REPLY. The return code is zero, unless end-
of-file is encountered, read times out, or an invalid file descriptor is supplied as the argument to -u.
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