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When running ruby scripts as such
ruby some-script.rb
How would I include a file (e.g. configuration file) in it dynamically?
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How to Use Command-Line Arguments. In your Ruby programs, you can access any command-line arguments passed by the shell with the ARGV special variable. ARGV is an Array variable which holds, as strings, each argument passed by the shell.
From the main menu, choose Tools | Load file/selection into IRB/Rails console.
Open a command line window and navigate to your Ruby scripts directory using the cd command. Once there, you can list files, using the dir command on Windows or the ls command on Linux or OS X. Your Ruby files will all have the . rb file extension.
As you have found, the -r option is your friend. It also works with IRB:
irb -ropen-uri
Will do the same as require 'open-uri'
FWIW, the most common thing I need to include via the command line is rubygems. And since newer versions of ruby come with gems built in I don't want to edit the file, but include it for testing. Luckily the folks who created gems added a little alias sugar.
You can do the following:
ruby -rubygems myscript.rb
Instead of the ugly:
ruby -rrubygems myscript.rb
OK, so it is one character, but thought it was extra polish to make me happier.
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Actually, I found it. It's the -r command line entry.
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