Script to extract the android package id (app id) from an android apk file, and another to uninstall an app when you have the apk handy.

getPackageName.sh

# extract the android package id from a built apk file
# usage ./getPackageName.sh <path-to-apk>
line=`aapt dump badging "$1" | grep package:\ name`

# above returns:
# package: name='com.calvium.myapp' versionCode='1' versionName='1.0'
if [[ $line =~ name=\'(.+)\'\ versionCode ]]; then
	echo ${BASH_REMATCH[1]}
else
	echo "Failed to find package name"
	exit 1
fi

uninstall.sh

_file="$1"
[ $# -eq 0 ] && { echo "Usage: $0 APK_FILENAME"; exit 1; }
[ ! -f "$_file" ] && { echo "Error: $0 file not found."; exit 2; }


here=`pwd`
cd $ANDROID_HOME/build-tools
cd * # go into ANY folder

# get package name from apk
line=`./aapt dump badging "$1" | grep package:\ name`

cd $here

# above returns:
# package: name='com.calvium.myapp' versionCode='1' versionName='1.0'
if [[ $line =~ name=\'(.+)\'\ versionCode ]]; then
	packageName="${BASH_REMATCH[1]}"
else
	echo "Failed to find package name"
	exit 1
fi

echo "Package name is $packageName"
adb uninstall $packageName || exit 1