Need one-line adb shell su push & pull to access /data from Windows batch file
Well, you have to do a few commands, as I don't believe it will work in one.

You need to do:


adb shell
su
cd /data/path/of/file
cp /data/path/of/file/copyme /data/local/tmp
chown shell.shell /data/local/tmp/copyme
exit
exit
adb pull /data/local/tmp/copyme /destination/copyme


This works for me every time.