Why does “find . -name *.txt | xargs du -hc” give multiple totals?

Question

I have a large set of directories for which I\'m trying to calculate the sum total size of several hundred .txt files. I tried this, which mostly works:

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Answer 1

One alternate solution is to use awk:

find . -name "*.txt" -exec ls -lt {} \; | awk -F " " 'BEGIN { sum=0 } { sum+=$5 } END { print sum }'