Calculating total file size by extension in a directory

gistfile1.txt

# SOURCE:
http://serverfault.com/questions/367185/calculating-total-file-size-by-extension-in-shell

# Specific extension:
find . -name '*.YOUR_EXTENSION' -exec ls -l {} \; | awk '{ Total += $5} END { print Total }'

# All extensions:
#!/bin/bash

ftypes=$(find . -type f | grep -E ".*\.[a-zA-Z0-9]*$" | sed -e 's/.*\(\.[a-zA-Z0-9]*\)$/\1/' | sort | uniq)

for ft in $ftypes
do
    echo -n "$ft "
    find . -name "*${ft}" -exec ls -l {} \; | awk '{total += $5} END {print total}'
done