1. [ytti@ytti.fi ~]% pry
  2. [1] pry(main)> def puts arg
  3. [1] pry(main)*   print "i\n"
  4. [1] pry(main)*   nil
  5. [1] pry(main)* end
  6. => :puts
  7. [2] pry(main)> puts 'k'
  8. i
  9. => nil
  10. [3] pry(main)>