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From: "Carl R. White" <crwhite@192.168.185.95>
Subject: Re: ROT13 (was: sigs)
Date: 1997/12/03
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On 30 Nov 1997, Tim Park wrote:

> 
> Veronica Karlsson (dream@on.spammer) writes:
> > Naqernf Freise jebgr:
> >> Veronica Karlsson wrote:
> >> > But that only works for text in posts people have already sent, not in
> >> > text you are writing... (at least I haven't found that button yet...)
> >> OK, I think writing a C program is the most elegant
> >> way to do it and you did it.
> > And it took me several minutes... (I had to look up "mod")
> 
> What about (from memory ^_^;)
> 
>   tr A-Z M-ZA-N <file | tr a-z m-za-n

I already posted the tr solution ;) (Head swells, feels bad). Try this for 
ROT-ANYNUMBER(1-26) Unix ksh only:
--------------------------------------------------------------------------
#!/bin/ksh -p
# Rot X pipe - like rot13. 1<=X<=26

lc="abcdefghijklmnopqrstuvwxyz"
uc="ABCDEFGHIJKLMNOPQRSTUVWXYZ"

x=$((${1}+1))
while (( x > 26 )) ; do
  x=$((x - 26))
done
while (( x <= 0 )) ; do
  x=$((x + 26))
done

lc2=$(echo $lc$lc | awk '{print substr($1, '$x', 26)}')
uc2=$(echo $uc$uc | awk '{print substr($1, '$x', 26)}')

tr "$lc$uc" "$lc2$uc2"
--------------------------------------------------------------------------
This is starting to look more like alt.unix.wizards!
--------------------------------------------------------------------------
For instance, this is "echo {something :) } | rot 13" :

	Gb or be abg gb or gung vf gur dhrfgvba

and this is something similar in rot 7:

	Hshz wvvy Fvypjr, ol pz iba h zrbss :)

To undo rotX you must use rot(26 - X), which is why people prefer rot13!
e.g. rot 7 -> rot 19 etc.

-- 
Carl R White   | e-mail...:                    crwhite-@-comp.brad.ac.uk
               | finger...:             crwhite-@-dcsun1.comp.brad.ac.uk
               | web......: http://www.student.comp.brad.ac.uk/~crwhite/
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