https://superuser.com/questions/520338/only-get-the-size-from-du-command-not-the-folder-names
https://stackoverflow.com/questions/18689592/how-to-get-file-size-in-bytes-from-shell-script
https://unix.stackexchange.com/questions/19882/directory-size-calculation-difference
Unix equivalent of `du -sb` to get summarized size in bytes
On Linux using GNU du to calculate the size of directory recursively in bytes I can run:
du -sb /etc
What is equivalent syntax for BSD du based on the fact that -b parameter is not available?
find $HOME | xargs stat -f%z | awk '{ s+=$1 } END { print s }'
...crawls thru $HOME, gets file sizes in bytes from stat and sums them up using awk.