You need to filter out directory entries. find -type f -ls|awk '{s += $7} END {print s}' find -type f -print0 | xargs -0 wc -c | tail -1 find -type

You need to filter out directory entries. find -type f -ls|awk '{s += $7} END {print s}' find -type f -print0 | xargs -0 wc -c | tail -1 find -type f -exec wc -c {} + | tail -1