Can a Ruby script tell what directory it’s in?

For newer versions of Ruby, try:

• __dir__

For older versions of Ruby (< 2.0), the script being run can be found using:

• File.dirname(__FILE__) – relative path; or
• File.expand_path(File.dirname(__FILE__)) – the absolute path.

Note: Using __dir__ will return the script path even after a call to Dir.chdir; whereas, using the older syntax may not return the path to the script.