-rcvs Load the (built-in) CSV module in Ruby. -e Eval the following string as Ruby code. CSV($<) Create CSV parser with standard input `$<` as the

-rcvs Load the (built-in) CSV module in Ruby. -e Eval the following string as Ruby code. CSV($<) Create CSV parser with standard input `$<` as the source. .each Run the code in the block that follows for each row (automatically skips the CSV header): { |r| puts r[0] } For a row, print the first/0th element. Can be simplified in recent Ruby: { puts _1[0] }