ROT13 - Implementation

Implementation

The ROT13 and ROT47 are fairly easy to implement using the Unix terminal application tr; to encrypt the string "The Quick Brown Fox Jumps Over The Lazy Dog" in ROT13:

$ # Map upper case A-Z to N-ZA-M and lower case a-z to n-za-m $ echo "The Quick Brown Fox Jumps Over The Lazy Dog" | tr 'A-Za-z' 'N-ZA-Mn-za-m' Gur Dhvpx Oebja Sbk Whzcf Bire Gur Ynml Qbt $ tr 'A-Za-z' 'N-ZA-Mn-za-m' <<<"The Quick Brown Fox Jumps Over The Lazy Dog" Gur Dhvpx Oebja Sbk Whzcf Bire Gur Ynml Qbt

and the same string for ROT47:

$ echo "The Quick Brown Fox Jumps Over The Lazy Dog" | tr '\!-~' 'P-~\!-O' %96 "F:4< qC@H? u@I yF>AD ~G6C %96 {2KJ s@8

and

$ tr '\!-~' 'P-~\!-O' <<<"The Quick Brown Fox Jumps Over The Lazy Dog" %96 "F:4< qC@H? u@I yF>AD ~G6C %96 {2KJ s@8

In the Vim text editor, one can ROT13 an entire file with the command:

ggVGg?

or, for larger files:

ggg?G