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

Question

Inspired by \"Getting the source directory of a Bash script from within\", what\'s the Ruby way to do this?

Answer 1

use __dir__

File.dirname(__FILE__) is not a proper way to get directory where script is stored.

At start working directory and directory with script file is the same, but it may change.

For example:

Dir.chdir('..') do
    puts __dir__
    puts File.expand_path(File.dirname(__FILE__))
end

for script file stored in /Desktop/tmp running it will give output

/home/mateusz/Desktop/tmp
/home/mateusz/Desktop