grep replacement

[andrew at alice.UUCP]

actually our version of the linderman sort doesn't do arbitrary-sized lines;
it does the REASONABLE thing of complaining when the lines are too long
rather than silently progressing (or looping or truncating or ...).
that is why gre will either work propoerly (handle any line length)
or settle on a (sensible) max length and complain if it gets an overflow.