UNIX terminal io incompatibility

[OLDMAN@USC-ISI.ARPA]

Data General Common LISP also has redirectable output.

   execute lisp/I=infile/O=outfile/E=errorfile

The presence of any of these switches causes the default bindings of
the standard streams to change.  *terminal-io* is still attached to
the console if one is available.  If one is not available (such as when
you are running in batch mode),  we have a slightly crazy set of rules
that "do the right thing".

-- Dan Oldman