Generates ASCII tractors.
This program generates ASCII tractors using the universal tractor coefficient (TC). The intended audience is practical ASCII tractor theorists and lay people interested in abstract tractor theory.
Before using this program, ensure that you understand the fundamental theorem of ASCII tractor mechanics:
"ASCII Tractors must have at least four wheels." 
Note that this theorem applies to side-on views. No useful models of two-sided ASCII tractors have been found, nor is there even any concrete proof of their existence.
In keeping with this theorem, TRACTORGEN will politely inform the user if any attempt to make tractors with less than four wheels is made (by calling abort(2) and dumping core).
Tractorgen takes one argument. This argument is indirectly related to the TC and is a cardinal enumerating the desired wheel configuration. If no argument is given, the optimal configuration of 7 is generated.
For example, if you want a tractor with 5 wheels, type at the shell prompt:
$ tractorgen 5
Conversely, if you want a tractor with 113 wheels, type:
$ tractorgen 113
Remember that tractors with large numbers of wheels may overflow the width of your terminal, with unpredictable results. Actually, it will probably just look like shit.
For updates and news regarding TRACTORGEN (both completely unlikely), see http://www.vergenet.net/~conrad/software/tractorgen/
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING for details.
Though I have no idea why you'd want to do any of this.
This was written by Kbert (email@example.com), more as a dare than anything else. Original inspiration from SCOboy for asking a dumb question.
 See, for example, "Introductory ASCII tractor design, vols 3-7", Blum&Merven, Slarken Press 1973.