IRB help

[alcina]

Im new to Ruby and isntalled Rails on Windows 8. I tried typing this in
IRB run it normal or as administrator and getting this result.

might have duplicated this post, first time posting on the group did not
see where my post is

irb(main):001:0> mkdir lesson2
NameError: undefined local variable or method lesson2' for main:Object from (irb):1 from C:/RailsInstaller/Ruby1.9.3/bin/irb:12:in’
irb(main):002:0> cd lesson

[etna]

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

[etna]

You can also execute system commands from within irb using “system”
system( “mkdir lesson2” )
or backticks
mkdir lesson2

Although in the case of “mkdir” you’ll probably want to use “Dir.pwd” to
check you’re in the right directory, and “Dir.chdir(‘c:/myfolder’)” to
move to the correct folder first.