# Create the directory tree for this example (c.txt is 5000 bytes, the other files are small) mkdir -p dir1/subdir1 dir2/subdir2 echo "Hello" > dir1/a.txt echo "Hello" > dir1/subdir1/b.txt yes "Hello" | head -c 5000 > dir2/c.txt echo "Hello" > dir2/subdir2/d.txt echo "Hello" > file1.txt du -c dir1 dir2