CODEWITHSUNDEEP
javascriptcommand-linenode-modules
Rob Kwasowski
Rob Kwasowski

Reputation: 2780

Simple node module command line example

I want to make a simple node module that can be run from the command line that I can input files into, then it might change every instance of 'red' to 'blue' for example and then save that as a new file. Is there a simple example out there somewhere that I can edit to fit my purposes? I've tried looking but couldn't find one that was sufficiently simple to understand how to modify it. Can anyone help?

Upvotes: 0

Views: 45

Answers (1)

vsemozhebuty
vsemozhebuty

Reputation: 13832

A simple example of replace.js (both old and new files are supposed to be in UTF-8 encoding):

'use strict';

const fs = require('fs');

const oldFilePath = process.argv[2];
const newFilePath = process.argv[3];

const oldFileContent = fs.readFileSync(oldFilePath, 'utf8');
const newFileContent = oldFileContent.replace(/red/g, 'blue');

fs.writeFileSync(newFilePath, newFileContent);

How to call:

node replace.js test.txt new_test.txt

Documentation on used API:

process.argv

fs.readFileSync()

fs.writeFileSync()

Upvotes: 1

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