Haddop df hack

#!/usr/bin/env ruby
if ARGV[0] == "-k"
orig_lines=`/bin/df #{ARGV.join(" ")}`.split("\n")
puts orig_lines[0]
orig_lines[1..-1].each do |line|
  numbers_line = line.split()
  numbers_line[1] = numbers_line[2].to_i + numbers_line[3].to_i
  puts numbers_line.join(" ")
end
else
puts `/bin/df #{ARGV.join(" ")}`
end