Retrieve WiFi password How to get saved WiFi password from my android 5.1.1  without rooting?

I checked the path /data/misc/wifi/ using adb pull from terminal, but it's empty
You can't get the passwords without root access because shell (adb) is not privileged to access the file containing those passwords. As you would know, the file wpa_supplicant.conf contains all the saved Wi-Fi passwords. In order to even ascertain the existence of that file, you must have read or executable permission until wifi directory. It just happened that the permissions on that directory is drwxrwx---, is owned by user wifi and  group wifi. Executing id tells us that shell is not part of wifi group, so it ultimately would be considered others. As you can see, the permissions for others are blank --- i.e. no read/write/execute permission is available, hence, you can't enter that directory, let alone copy a particular file residing inside it.

Root the device if you want that file badly. 

Related reading: File permissions and attributes