Run a Ruby library from the command-line

Question

I\'ve just learned the basics of Ruby after being very happy with Python for several years (I\'m still using Python for some things), but I\'d like to know if there\'s an id

Answer 1

While

if __FILE__ == $0
  Foo.run
end

is the common approach, I'm currently using

if File.identical?(__FILE__, $0)
  Foo.run
end

because programs like ruby-prof can make $0 not equal __FILE__ even when you use --replace-progname.