Starting form Dave Thomas script I've been able to write my own solution to overcome 2 problems:
This is my script, that copies app data to sdcard and then pull it
#Check we have one connected device
adb devices -l | grep -e 'device\b' > /dev/null
if [ $? -gt 0 ]; then
echo "No device connected to adb."
exit 1
fi
# Set filename or directory to pull from device
# Set package name we will run as
while getopts f:p: opt; do
case $opt in
f)
fileToPull=$OPTARG
;;
p)
packageName=$OPTARG
;;
esac
done;
# Block package name arg from being blank
if [ -z "$packageName" ]; then
echo "Please specify package name to run as when pulling file"
exit 1
fi
# Check package exists
adb shell pm list packages | grep "$packageName" > /dev/null
if [ $? -gt 0 ]; then
echo "Package name $packageName does not exist on device"
exit 1
fi
adb shell "run-as $packageName cp -r /data/data/$packageName/ /sdcard/$packageName"
adb pull /sdcard/$packageName
adb shell rm -rf /sdcard/$packageName