fsize
Accumulate file sizes in a directory without counting dir nodes
When you synchronize 2 file repositories with rsync, then you want to use fsize to show you if both sides show up with the same amount of files and with the same file sizes. Using du always counts files and directories (option -sb), which can result in different sizes. A directory node may use 12 KB on the rsync source and 16 KB on the rsync destination.