pbcopy for irb sessions.

.irbrc

IRB.conf[:PROMPT_MODE] = :DEFAULT                                                                                                                                                
                                                                                                                                                                                 
def pbcopy(input)                                                                                                                                                                
  str = input.to_s                                                                                                                                                               
  IO.popen('pbcopy', 'w') { |f| f << str }                                                                                                                                       
  str                                                                                                                                                                            
end                                                                                                                                                                              
                                                                                                                                                                                 
def pbpaste                                                                                                                                                                      
  `pbpaste`                                                                                                                                                                      
end