test -t some-file, etc.

[Dan Jacobson]

       -t fd  True if file descriptor fd is open and refers to  a
              terminal.

$? is found at char 1 of my next prompt:
1/tmp$ test -t a
0/tmp$ test -t addsds
0/tmp$ test -t 11    
1/tmp$ test -t /dev/tty
0/tmp$ test -t /dev/tty4
0/tmp$ test -t /dev/tty4444444...
only the results for test -t 11 and test -t /dev/tty am I happy with 

Also, I was hoping the test 'help' and 'man' information would say what
happens when fd is ommitted, i.e. test -t
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