[javascript] node.js execute system command synchronously

I actually had a situation where I needed to run multiple commands one after another from a package.json preinstall script in a way that would work on both Windows and Linux/OSX, so I couldn't rely on a non-core module.

So this is what I came up with:

#cmds.coffee
childproc = require 'child_process'

exports.exec = (cmds) ->
  next = ->
    if cmds.length > 0
      cmd = cmds.shift()
      console.log "Running command: #{cmd}"
      childproc.exec cmd, (err, stdout, stderr) ->
        if err? then console.log err
        if stdout? then console.log stdout
        if stderr? then console.log stderr
        next()
    else
      console.log "Done executing commands."

  console.log "Running the follows commands:"
  console.log cmds
  next()

You can use it like this:

require('./cmds').exec ['grunt coffee', 'nodeunit test/tls-config.js']

EDIT: as pointed out, this doesn't actually return the output or allow you to use the result of the commands in a Node program. One other idea for that is to use LiveScript backcalls. http://livescript.net/

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