Write a shell script to encrypt the content of a file using logic .
(i) Replace a character by just next character in the cycle for example A by B ( or a by b), B by C (or b by c), Y by Z (or y by z), Z by A ( or z by a).
(ii) Leave numbers and any other symbols unchanged.
#!/bin/bash str="" echo " enter a file name " read str cat $str | tr '[abcdefghijklmnopqrstuvwxyz]' '[bcdefghijklmnopqrstuvwxyza]' | tr '[ABCDEFGHIJKLMNOPQRSTUVWXUZ]' '[BCDEFGHIJKLMNOPQRSTUVWXUZA]' >output.txt cat output.txt