Android Stop Emulator from Command Line

To stop all running emulators we use this command:

adb devices | grep emulator | cut -f1 | while read line; do adb -s $line emu kill; done

May be adb kill-server helps for you?

or

adb -s emulator-5544 emu kill, where emulator-5544 - emulator name.

For Linux users it will be

adb devices | grep emulator | cut -f1 | while read line; do adb -s $line emu kill; done