Latex character count

#!/bin/sh

documents=$(find . | grep -e "\.tex$")
sum=0
sum_space=0

for doc in $documents
do
    echo "Reading $doc"
    letters_text=$(/Library/TeX/texbin/texcount -char $doc | grep 'Letters in text' | grep -o -E '[0-9]+')
    letters_headers=$(/Library/TeX/texbin/texcount -char $doc | grep 'Letters in headers' | grep -o -E '[0-9]+')

    words_text=$(/Library/TeX/texbin/texcount $doc | grep 'Words in text' | grep -o -E '[0-9]+')
    words_headers=$(/Library/TeX/texbin/texcount $doc | grep 'Words in headers' | grep -o -E '[0-9]+')

    letters=$(($letters_text+$letters_headers))
    words=$(($words_text+$words_headers))

    sum=$(($sum+$letters))
    sum_space=$(($sum_space+$letters+$words))
done

echo "--- Results ---"
echo "The total sum of characters (excluding space): $sum"
echo "The total sum of characters (including space): $sum_space"
pages=$(echo "print $sum_space/2400" | perl)
echo "Pages: $pages"