How to use ADB Shell when Multiple Devices are connected? Fails with "error: more than one device and emulator"

$ adb --help

-s SERIAL  use device with given serial (overrides $ANDROID_SERIAL)

$ adb devices
List of devices attached 
emulator-5554   device
7f1c864e    device

$ adb shell -s 7f1c864e
error: more than one device and emulator

Solution

Use the -s option BEFORE the command to specify the device, for example:

adb -s 7f1c864e shell

For multiple Emulator, use the process's IP and port as the id, like:

adb -s 192.168.232.2:5555 <command>

See How to get the Android Emulator's IP address?

But if there is only a single Emulator, try:
adb -e <command>