Renice a process by name on a Mac

renice-by-name

#!/usr/bin/env ruby
begin
  if ARGV.length == 1
    %x[sudo renice -10 `pgrep -f -i #{ARGV[0]}`]
  else
    %x[sudo renice #{ARGV[0]} `pgrep -f -i #{ARGV[1]}`]
  end
rescue
  puts "There was an error, try: renice-by-name <(-10..10)> process_name"
end