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Path: utzoo!linus!philabs!seismo!rlgvax!guy
From: guy@rlgvax.UUCP (Guy Harris)
Newsgroups: net.wanted
Subject: Re: Info on ROT Wanted - (nf)
Message-ID: <1545@rlgvax.UUCP>
Date: Fri, 13-Jan-84 12:49:52 EST
Article-I.D.: rlgvax.1545
Posted: Fri Jan 13 12:49:52 1984
Date-Received: Sat, 14-Jan-84 04:11:22 EST
References: <2272@fortune.UUCP>
Organization: CCI Office Systems Group, Reston, VA
Lines: 30


	Now put your cursor on the line (in 'vi') and type
	"!!tr a-zAZ a-zaB-XA" (copied from another newsgroup, where
	it was noted non-Berkeley 'tr' needs [a-z][A-Z]) and the line
	will magically disappear and come back as...

1) If you don't have an editor which can take text, run it through a filter,
and stick the output of the filter back into the file, just edit the file
normally and run it through the filter; if you want to rotate only part of
it, do some cut and paste work on the original and the filtered output.

2) I suspect "non-Berkeley 'tr'" should translate as "USG UNIX 'tr'", i.e.
System III and System V 'tr', among others.  The original V7 'tr' -
and possibly the original V6 'tr' - may have ran as the Berkeley one does.
(There *are* news sites out there on PDP-11s running V7!)

	That is a "rot 1" (or maybe -1). I leave it to you to figure out
	the letters for rot 13 (you want to decode it with rot -13). ...
	(And I may have + and - all wrong.)

Since rotations are modulo 26, rot 13 and rot -13 are the same, which is why
13 is the proper rotation for jokes (so nobody has to figure out the
direction of the rotation and nobody has to have two rotators).  The
proper translation for rot 13 is:

	tr "[a-zA-Z]" "[n-za-mN-ZA-M]"  # for USG systems
	tr "a-zA-Z" "n-za-mN-ZA-M"      # for non-USG systems

	Guy Harris
	{seismo,ihnp4,allegra}!rlgvax!guy