xdotool: added more examples (#1650)

pages/linux/xdotool.md

@@ -9,3 +9,19 @@
 - Click the right mouse button:
 
 `xdotool click {{3}}`
+
+- Get the id of the currently active window:
+
+`xdotool getactivewindow`
+
+- Focus on the window with id of 12345:
+
+`xdotool windowfocus --sync {{12345}}`
+
+- Type a message, with a 500ms delay for each letter:
+
+`xdotool type --delay {{500}} "Hello world"`
+
+- Press the enter key:
+
+`xdotool key {{KP_Enter}}`