Unix Tip #4515- July 22, 2023


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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

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

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


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