opendir failed, Permission denied 不ROOT

127|shell@android:/ $ cd data/data
cd /data
shell@android:/data $ ls
ls
opendir failed, Permission denied
解决办法:
shell@android:cd data/data
run-as com.your.package
shell@android:[color=darkred]$ run-as com.your.package [/color]
cd /data/data/com.your.package
shell@android:/data/data/com.your.package $ ls
ls
cache
databases
lib
shared_prefs
shell@android:/data/data/com.your.package $ cd databases
cd databases
shell@android:/data/data/com.your.package/databases $ ls
yourpackagename.db
$ [color=darkred]cat preferences.db > /mnt/sdcard/yourpackagename.db[/color]