Just looking through the manpage for the "sparc/i386/vax" programs.
u3b True if you are on a 3B20 computer.
u3b2 True if you are on a 3B2 computer.
u3b5 True if you are on a 3B5 computer.
u3b15 True if you are on a 3B15 computer.
What's a u3b ?
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The words of the unwary are apt to cause needless pain and bloody violence.
- Zen Master Greg