A little synchronous grep

littlegrep_sync.js

(function() {
	const fs = require('fs');
	if (process.argv.length < 4) {
		console.error('Not enough parameters given. Try this: "node findinfile_sync filename.txt term"'); 
		process.exit(1);
	}
	
	const filename = process.argv[2];
	const searchterm = process.argv[3];

	const contents = fs.readFileSync(filename, 'utf-8');
	
	var buffer = '';
	for(i = 0; i<contents.length; i++) {
		if(contents[i] === '\n') {
			if(buffer.indexOf(searchterm) > -1) {
				console.log(buffer);
			}
			buffer = '';
			continue;
		}
		buffer += contents[i];
	}

	console.log('Results above');
})();