ROT13 In Bash On Linux Code Cipher Example

Code:

sudo gedit .bashrc

Code:

function rot13 {
if [ -r $1 ]; then cat $1 | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]'; else echo $* | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]';
fi
}

# alias rot13="tr a-zA-Z n-za-mN-ZA-M"

Example.sh

Code:

#!/bin/bash
# Usage: ./example.sh "uryyb gurer"
echo "$@" | rot13

Code:

./example.sh "uryyb gurer"

Decryption is easy since 13 is the half way point of the 26 chars in the alphabet, so running this cypher will reveal the plaintext or Decrypted text!