Unix Tip: ROTATE THE ALPHABET

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3499 - September 8, 2011

http://www.ugu.com/sui/ugu/show?tip.today

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ROTATE THE ALPHABET

Rot13 simply rotates any
alphabet characters but 13
places, so the letter 'a'
becomes a letter 'n', and
an 'x' becomes a 'k' etc...

To encode a file type:

% rot13 <filename>

And repeat to decode.

(Note original file is
overwritten by encrypted
version.)

Simply create this small
script, and save with the
filename of 'rot13'
remembering to set
appropriate permissions.

#!/usr/local/bin/bash

tr '[a-m][n-z][A-M][N-Z]' '[n-z][a-m][N-Z][A-M]' < $1 1>temp1;

mv temp1 $1;

This tip generously supported by: dan.mcgrath@virginmobile.com

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