Batch install apks to multiple connected devices

batch_install_apk.sh

#!/bin/sh
adb devices | tail -n +2 | cut -sf 1 | xargs -I \{\} -P4 adb -s \{\} install -r $1

Don't know if you'll see this or not but I found this it's what I've been looking for but I can't get it to work it comes up and says it dont know what tail -n +2 i know what you said it didn't but I have no idea how to fix it I want to be able to plug three devices into laptop hit run and have them all get installed one app hope you see this thanks

#!/bin/sh
adb devices | tail -n +2 | cut -sf 1 | xargs -I {} -P4 adb -s {} install -r $1

@user2user1
tail -n +2

• Skips the first line of adb devices output (which is just a header).
• Since the output of adb devices looks like this:

List of devices attached
emulator-5554   device
emulator-5556   device

Here, the first line is not needed, so tail -n +2 removes it.