Execute Commands form command line in Node.js

execute-command.js

// http://nodejs.org/api.html#_child_processes
var sys = require('sys')
var exec = require('child_process').exec;
var child;
// executes `pwd`
child = exec("pwd", function (error, stdout, stderr) {
  sys.print('stdout: ' + stdout);
  sys.print('stderr: ' + stderr);
  if (error !== null) {
    console.log('exec error: ' + error);
  }
});
// or more concisely
var sys = require('sys')
var exec = require('child_process').exec;
function puts(error, stdout, stderr) { sys.puts(stdout) }
exec("ls -la", puts);

https://dzone.com/articles/execute-unix-command-nodejs
https://nodejs.org/api/child_process.html
https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options

/If you need to use the process output as a stream, such as when you are expecting large amounts of output, use child_process.spawn:/
var spawn = require('child_process').spawn;
var child = spawn('prince', [
'-v', 'builds/pdf/book.html',
'-o', 'builds/pdf/book.pdf'
]);

child.stdout.on('data', function(chunk) {
// output will be here in chunks
});

// or if you want to send output elsewhere
child.stdout.pipe(dest);

/If you are executing a file rather than a command, you might want to use child_process.execFile, which accepts almost identical parameters to spawn, but has a fourth callback parameter like exec. That might look a bit like this:/
var execFile = require('child_process').execFile;
exexFile(file, args, options, function(error, stdout, stderr) {
// command output is in stdout
});