run shell command
	@param cmd: command to execute
	@param timeout: timeout for command execution
	@param window: the PySimpleGUI window that the output is going to (needed to do refresh on)
	@return: (return code from command, command output)

def runCommand(cmd, timeout=None, window=None):
    """ run shell command
	@param cmd: command to execute
	@param timeout: timeout for command execution
	@param window: the PySimpleGUI window that the output is going to (needed to do refresh on)
	@return: (return code from command, command output)
	"""
    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    output = ''
    for line in p.stdout:
        line = line.decode(errors='replace' if (sys.version_info) < (3, 5) else 'backslashreplace').rstrip()
        output += line
        print(line)
        window.Refresh() if window else None        # yes, a 1-line if, so shoot me

    retval = p.wait(timeout)
    return (retval, output)