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Gforth Manual

3.26.2 Create file for output

s" foo.out" w/o create-file throw Value fd-out

The available file modes are r/o for read-only access, r/w for read-write access, and w/o for write-only access. You could open both files with r/w, too, if you like. All file words return error codes; for most applications, it's best to pass there error codes with throw to the outer error handler.

If you want words for opening and assigning, define them as follows:

0 Value fd-in 0 Value fd-out : open-input ( addr u -- ) r/o open-file throw to fd-in ; : open-output ( addr u -- ) w/o create-file throw to fd-out ;

Usage example:

s" foo.in" open-input s" foo.out" open-output