How to run commands via NodeJS child process?

Question

I am trying to run commands on Windows via NodeJS child processes:

var terminal = require('child_process').spawn('cmd');  terminal.stdout.on('data', function (data) {     console.log('stdout: ' + data); });  terminal.stderr.on('data', function (data) {     console.log('stderr: ' + data); });  terminal.on('exit', function (code) {     console.log('child process exited with code ' + code); });  setTimeout(function() {     terminal.stdin.write('echo %PATH%'); }, 2000); 

When it calls ti.stdin.write, it writes it to the stdin descriptor, but how do I trigger cmd to react at this point? How do I send the "enter" key signal that you do when you are actually typing in command prompt? Currently I get no response from cmd.

Answer 1

Sending a newline \n will exectue the command. .end() will exit the shell.

I modified the example to work with bash as I'm on osx.

var terminal = require('child_process').spawn('bash');  terminal.stdout.on('data', function (data) {     console.log('stdout: ' + data); });  terminal.on('exit', function (code) {     console.log('child process exited with code ' + code); });  setTimeout(function() {     console.log('Sending stdin to terminal');     terminal.stdin.write('echo "Hello $USER. Your machine runs since:"\n');     terminal.stdin.write('uptime\n');     console.log('Ending terminal session');     terminal.stdin.end(); }, 1000); 

The output will be:

Sending stdin to terminal Ending terminal session stdout: Hello root. Your machine runs since: stdout: 9:47  up 50 mins, 2 users, load averages: 1.75 1.58 1.42 child process exited with code 0 

Answer 2

You just have to send line end (\n) with the command:

setTimeout(function() {     terminal.stdin.write('echo %PATH%\n'); }, 2000);