A zero byte file is a file that is placed in your hard drive with no data inside it. This means it has a size or length of zero bytes. If you want to list all zero byte files in a particular location in your hard drive under Ubuntu or any other Linux-based system, you can simply use the "Find" command line utility.
To scan for example the current terminal location for zero length files, you can use this command:
find -size 0
To scan a particular directory (the home directory for example), use this command:
find ~/ -size 0
To scan your root folder, use this command:
find / -size 0