How to run Ruby code from terminal?

Question

I need to run a few lines of Ruby code from terminal, but I can't find the needed parameter for it.

Can you explain how to do this?

Possible duplicate of [How to execute a Ruby script in Terminal?](https://stackoverflow.com/questions/8721369/how-to-execute-a-ruby-script-in-terminal) — ymoreau, Aug 17 '18 at 08:56
You can use online IDE to run your code. That's possible write code or upload file. https://repl.it/languages/ruby — Darlan Dieterich, May 14 '19 at 14:48

score 204 · Answer 1 · edited Sep 17 '13 at 21:01

204

If Ruby is installed, then

ruby yourfile.rb

where yourfile.rb is the file containing the ruby code.

Or

irb

to start the interactive Ruby environment, where you can type lines of code and see the results immediately.

edited Sep 17 '13 at 21:01

Raj

answered Sep 11 '12 at 22:26

theglauber

score 62 · Answer 2 · edited Mar 30 '16 at 22:30

62

You can run ruby commands in one line with the -e flag:

ruby -e "puts 'hi'"

Check the man page for more information.

edited Mar 30 '16 at 22:30

the Tin Man

answered Sep 11 '12 at 22:28

1

@AndreshPodzimovsky You need to `require 'date'`. So: `ruby -e "require 'date'; Date.new(2012,12,31).yday"` – LanguagesNamedAfterCofee Sep 11 '12 at 22:34
7

You probably also want to print the result to stdout: `ruby -r date -e "puts Date.new(2012,12,31).yday"` – Joshua Cheek Sep 11 '12 at 22:43
4

@JoshuaCheek +1 for mentioning the `-r` flag. – LanguagesNamedAfterCofee Sep 11 '12 at 22:54

2 Answers2