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Simple caesar Cipher [En,De]coder

A simple implementation of a CLI tool to work with caesar ciphers. The default implementation is ROT-13, but can be adjusted for any offset. Works on files and string arguments passed via CLI.

python3 caesar.py

usage: caesar.py [-h] [-d] [-o OFFSET] (-f FILE | -s STRING)
caesar.py: error: one of the arguments -f/--file -s/--string is required
python3 caesar.py -s "have you tried turning it off and on again?"
unir lbh gevrq gheavat vg bss naq ba ntnva?
python3 caesar.py -d -s "unir lbh gevrq gheavat vg bss naq ba ntnva?" 
have you tried turning it off and on again?
python3 caesar.py -s "have you tried turning it off and on again?" -o -4
dwra ukq pneaz pqnjejc ep kbb wjz kj wcwej?