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Ruby Ruby Basics (Retired) How Ruby Works Hello World!

Posted by john larson
john larson
16,594 Points

'clear' is not recognized as an internal or external command, operable program or batch file.

I have ruby installed
ruby -v returns ruby 2.3.1p112...
irb returns irb(main):...
puts "hello" returns hello => nil
exit brings back the prompt
Everything seems to be fine following 
along with the wideo
I have a document on my desktop hello.rb
in my editor, I type 
puts "Hello World"
outputs 
Hello World to the document
So I think I have things set up MOSTLY
but I'm missing something BECAUSE...
after typing exit (from irb)
when I type clear, I get this error
'clear' is not recognized as an internal or 
external command, operable program or batch file.
john larson
john larson
16,594 Points

I'm working in my own console, with my own editor and a hello.rb document on my desktop.

john larson
john larson
16,594 Points

I rebooted (which I hate to do cause win 10 something stupid always does, and tells me they're improving my experience) I was still getting the error. And then I looked again at your post. As many times as I saw cls as you had written, my mind was reading clr (abr for clear). Thanks, your post helped. It was when I read it for the 10nth time that I actually saw "short for clear screen" not "short for clear".

john larson
john larson
16,594 Points

Andren, I just really want to thank you again for your help. I'm working through the course in my own environment now. Everything is cool (for the moment). I just don't feel like I'm really learning when I'm in workspaces.

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

Assuming you are using the Windows command line (cmd) there doesn't seem to be anything wrong. Clear is the command used to clear the terminal on OSX and Linux systems. For cmd the corresponding command is cls, short for clear screen.

Do note though that there is a different more advanced command line application available on Windows called Powershell which supports most of the standard OSX/Linux style commands. Using that instead of the normal cmd might make it easier for you to follow the tutorials on this site.

To open Powershell just open the start menu and type Powershell and the first result should launch it on your machine.

john larson
john larson
16,594 Points

Thank you so much Andren.

john larson
john larson
16,594 Points

I'm thinking I need to install ruby for powershell somehow? Cause I opened powershell typed in ruby -v and it didn't recognize the command.

andren
andren
28,558 Points
andren
andren
28,558 Points

Have you rebooted Windows since you installed ruby? Powershell should have access to the same programs that cmd does.