One-liner sum numbers in CSV file

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perl -n -a -F; -e '$sum += $F[2]; END {print $sum}' examples/perlarrays/process_csv_file.csv

-n  = loop over lines but do NOT print them
-a  = autosplit by ' ' and assign to @F
-F; = replace the split string by ';'

The END block gets executed at the end of the execution and only once.