Caesar cipher CLI tool

CLI tool that will encode and decode a text by Caesar cipher.

CLI tool could accept 4 options (short alias and full name):

1. -a, --action: an action encode/decode
2. -s, --shift: a shift
3. -i, --input: an input file
4. -o, --output: an output file

Details:

• For encoding/decoding using only the English alphabet, all other characters will be kept untouched.
• Action (encode/decode) and the shift (integer) are required
• If the input file is missed - stdin will be used as an input source.
• If the output file is missed - stdout will be used as an output destination.
• If passed params are fine, the output (file or stdout) will contain encoded/decoded content of input (file or stdin).

Installation

CLI tool requires Node.js v12+

Install the dependencies.

cd caesar-cipher-cli
npm install

Usage example:

node index -a encode -s 7 -i ./files/input.txt -o ./files/output.txt

node index --action encode --shift 5 --input "./files/input.txt" --output "./files/output.txt"

node index --action decode --shift 5 --input "./files/input.txt" --output "./files/output.txt"

input.txt: “Code never lies; comments sometimes do.” — Ron Jeffries

output.txt: “Htij sjajw qnjx; htrrjsyx xtrjynrjx it.” — Wts Ojkkwnjx

Tech

CLI tool uses a number of open source projects to work properly:

• node.js - evented I/O for the backend
• minimist - great cli argument parser

ISC License (ISC)

Copyright (c) 2020, Pavel V.