Restart android machine
Have you tried simply 'reboot' with adb?
adb reboot
Also you can run complete shell scripts (e.g. to reboot your emulator) via adb:
adb shell <command>
The official docs can be found here.
You can reboot the device by sending the following broadcast:
$ adb shell am broadcast -a android.intent.action.BOOT_COMPLETED
adb reboot should not reboot your linux box.
But in any case, you can redirect the command to a specific adb device using adb -s <device_id> command , where
Device ID can be obtained from the command adb devices
command in this case is reboot