Run a shell script with Nodejs

Question

I need to create a page using nodejs, which will contain a "Turn on/Off" button. By pressing this button I intend to make the call from the same route, but passing a parameter: on/off or 0/1, etc.. When making this call, I will treat the received parameter and then run a script called "on.js" or "off.js". These scripts will be in the same server folder. I imagined that in "File System" there would be something like PHP’s "exec()" function, but I couldn’t find it. In PHP, for example, something like exec( "/meu_path/meu_script.js $onOff");. How do I execute a script on Node?

Answer 1

If you want to run a script .js best is to create functions in these scripts and do require or import these scripts so you can run these functions when needed.

If the scripts are not Javascript you can do so, a suggestion that accepts several commands and runs them sequentially:

"use strict;"

var exec = require('child_process').exec;

const commands = [
	'sudo comando1',
	'sudo comando2'
];

function runCommand(cmds, cb){
	const next = cmds.shift();
	if (!next) return cb();
	exec(next, {
		cwd: __dirname
	}, (err, stdout, stderr) => {
		console.log(stdout);
		if (err && !next.match(/\-s$/)) {
			console.log(`O commando "${next}" falhou.`, err);
			cb(err);
		}
		else runCommand(cmds, cb);
	});
}

runCommand(commands, err => {
	console.log('Script corrido');
});

If you want to run only 1 command you can simplify and do so:

"use strict;"

var exec = require('child_process').exec;
const cmd = 'sudo comando1';

exec(cmd, {
  cwd: __dirname
}, (err, stdout, stderr) => {
  console.log(stdout);
  if (err) console.log(err);
  else runCommand(cmds, cb);
});