Ruby - Introduction Commandline Argument

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Introduction

Ruby places any parameters that are appended to the command line when you launch your Ruby program into a special array called ARGV.

To test it out, create a new script called argv.rb and use this code: 

puts ARGV.join('-')

From the command prompt, run the script like so: 

ruby argv.rb

The result will be blank, but then try to run it like so: 

ruby argv.rb test 123

Output: 

test-123

Here, the parameters are taken from ARGV, joined together with a hyphen, and displayed on the screen.