[NodeJS] Spawn a child process and write a pid file

spawn.js

!/usr/bin/env node

var spawn = require('child_process').spawn;
var fs = require('fs');

var c = spawn(process.argv[3], process.argv.slice(4), { stdio: 'inherit' });

if (c.pid) {
    pidFile = fs.createWriteStream(process.argv[2]);
    pidFile.write(c.pid.toString());
    pidFile.end();
}

c.on("error", function(err) {
    console.error(err);
})

c.on("close", function(err) {
    fs.unlink(process.argv[2], function (err) {});
});

# Example usage:
# $ ./scripts/spawn.js ./data/test.pid sleep 10