function _drush_get_os

8.0.x _drush_get_os($os = NULL)
6.x _drush_get_os($os = NULL)
7.x _drush_get_os($os = NULL)
5.x _drush_get_os($os = NULL)
master _drush_get_os($os = NULL)

Return the OS we are running under.

Return value

string Linux WIN* (e.g. WINNT) CYGWIN MINGW* (e.g. MINGW32)

3 calls to _drush_get_os()
drush_build_drush_command in includes/
Build a drush command suitable for use for Drush to call itself e.g. in backend_invoke.
_drush_convert_path in includes/
Converts a Windows path (dir1\dir2\dir3) into a Unix path (dir1/dir2/dir3). Also converts a cygwin "drive emulation" path (/cygdrive/c/dir1) into a proper drive path, still with Unix slashes (c:/dir1).
_drush_test_os in includes/


includes/, line 569
Functions used by drush to query the environment and setting the current configuration.


function _drush_get_os($os = NULL) {
  // The special os "CWRSYNC" can be used to indicate that we are testing
  // a path that will be passed as an argument to cwRsync, which requires
  // that the path be converted to /cygdrive/c/path, even on DOS or Powershell.
  // The special os "RSYNC" can be used to indicate that we want to assume
  // "CWRSYNC" when cwrsync is installed, or default to the local OS otherwise.
  if (strtoupper($os) == "RSYNC") {
    $os = _drush_get_os("LOCAL");
    // For now we assume that cwrsync is always installed on Windows, and never installed son any other platform.
    return drush_is_windows($os) ? "CWRSYNC" : $os;
  // We allow "LOCAL" to document, in instances where some parameters are being escaped
  // for use on a remote machine, that one particular parameter will always be used on
  // the local machine (c.f. drush_backend_invoke).
  if (isset($os) && ($os != "LOCAL")) {
    return $os;
  if (_drush_test_os(getenv("MSYSTEM"), array("MINGW"))) {
    return getenv("MSYSTEM");
  // QUESTION: Can we differentiate between DOS and POWERSHELL? They appear to have the same environment.
  // At the moment, it does not seem to matter; they behave the same from PHP.
  // At this point we will just return PHP_OS.
  return PHP_OS;