Ruby Keyword: __FILE__ - rking/pry-docmore GitHub Wiki

The filename of the code being evaluated. Evaluates to "(pry)" within the REPL.

Useful especially for code to locate parts nearby, such as:

File.dirname(__FILE__)

Note that it is a relative path that doesn't work well with Dir.chdir changes. See: http://stackoverflow.com/questions/224379/what-does-file-mean-in-ruby/894056#894056