diff --git a/bin/osx_lock_computer b/bin/osx_lock_computer
new file mode 100755
index 0000000000..13e3021304
--- /dev/null
+++ b/bin/osx_lock_computer
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+sleep 0.5
+
+if [[ "$(ioreg -c AppleSmartBattery | grep '"ExternalConnected" = Yes')" ]]; then
+  # Plugged in: start screensaver.
+  open /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSaverEngine.app
+else
+  # Battery power: go to lock menu.
+  /System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend
+fi