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UGU: Unix Guru Universe - Unix Tip #4515- July 22, 2025
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Unix Tip #4515- July 22, 2025
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.
LAST 5 TIPS
4514
- RECREATING DIRECTORY TREES
4513
- DID IT REBOOT?
4512
- TERMINAL RESET
4511
- RENICE CPU HOGS
4510
- NICE NOT SO NICE
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