This is a command line application. It encrypts and decrypts text with Caesar's cipher. The application encrypts and decrypts only letters of the Latin alphabet. All other characters remain unchanged.
To install this application, you must perform the following steps:
- Download it from this repository.
- Run the command line and go to the application folder.
- Enter the command "npm install" or "npm i" and wait for the dependency installation process to complete.
- The application is ready to go!
In command line type "node app" then specify options you want to use. For example: "node app -s 5 -a encode -i ./1.txt -o ./2.txt". Then run it.
Avaible options and their description:
- -s, --shift: a shift
- -i, --input: an input file
- -o, --output an output file
- -a, --action: an action (encode/decode)
The shift and action options are required. Without them application will not run.
- The shift option must be an integer (no matter if it negative or positive).
- The input option must be a path to input file. If this option is not specifed - stdin will be using as an input source. If this option specifed but the file is doesn't exist or there is no access to read it - error will be thrown.
- The output option must be a path to output file. If this option is not specifed - stdout will be using as an output destination. If this option specifed but the file is doesn't exist or there is no access to write here - error will be thrown.
- The action must be an "encode" or "decode" only. Otherwise error will be thrown. An "encode" argument will be encrypt text. A "decode" argument will be decrypt text.
>node app --shift 5 --input ./input.txt --output ./output.txt --action encode
input.txt: Some text
output.txt: Xtrj yjcy
>node app -s 1 -o ./output.txt -a decode
stdin: Hello world!
output.txt: Gdkkn vnqkc!
>node app -s 2 --input ./input.txt -a decode
input.txt: English text, Русский текст, 123, &#$
stdout: Clejgqf rcvr, Русский текст, 123, &#$
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