bug or undocumented feature

[Mitch Frazier]

Someone just pointed out to me at the link below that you can close open
files in bash using "n>&-", for example:

   exec 7<file    # Open file on fd 7
   exec 7>&-      # Close fd 7

The close appears to be a special case of (from the man page):

> Similarly, the redirection operator
> 
>       [n]>&digit-
> 
> moves the file descriptor digit to file descriptor n,
> or the standard output (file descriptor 1) if n is not
> specified.

Not sure if that's a bug or a feature but it should be a feature and
probably should be documented.

Link: http://www.linuxjournal.com/node/1008709