The output (stdout and stderr) of a process started via
Runtime.exec() or ProcessBuilder.start() is always directed to a pipe
that can only be read by the creating Java process.

We need to be able to re-create the functionality that comes standard
with most command processors
command > filename  # redirect subprocess output into a file
command             # subprocess output goes to same location as parent output

On a particular platform, one can usually work around this using a shell
script or similar mechanism

new ProcessBuilder("/bin/sh", "-c", "command > file 2>&1").start();

  xxxxx@xxxxx   2003-11-26

Intuitively, the stdout and stderr of a child process should simply
be settable attributes of ProcessBuilder().  But you can't pass
a stream, because non-Java children couldn't understand that; 
you have to pass a lower-level object like a FileDescriptor.

  xxxxx@xxxxx   2003-11-26

A platform independent way of redirecting these output streams to the null device would also be useful (i.e. NUL on windows, /dev/null on *nix).