Ever wanted to obtain an APK from an Android device? You do not need to install fancy Apps for this, ADB and the following minimal Bash script is sufficient to do so. Use the App's bundle identifier as first argument.

download_apks.sh

#!/bin/bash
# Usage: ./download_apks.sh com.example.app

BUNDLE_FILES=$(adb shell pm path "$1")

for file in $BUNDLE_FILES; do
	CLEAN=$(echo "$file"|sed 's/[^:]*://')
	adb pull "$CLEAN" .
done