Hi there, The problem is that you're trying to run a command that's not a part of Ruby, but just part of the basic command tools Windows provides. When you type "mkdir lesson2", you're giving the command to create a folder named "lesson2", however, like I said, this is not part of Ruby and IRB.
Solution is to exit IRB (CTRL+D?) and then putting the command "mkdir lesson2", after which you can open IRB again to try some Ruby code. I hope this helps! If you have any other questions, feel free to let me know :-) -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/cde6563cbcec5ea0671e4cdd472a2a38%40ruby-forum.com. For more options, visit https://groups.google.com/groups/opt_out.
