Can a Ruby script tell what directory it’s in?
For older versions of Ruby (< 2.0), the script being run can be found using:
File.dirname(__FILE__)
- relative path; orFile.expand_path(File.dirname(__FILE__))
- the absolute path.
For newer versions of Ruby, try:
__dir__
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.
Use __dir__
As of Ruby 2.0, __dir__
is the simplest way to get this. It
Returns the canonicalized absolute path of the directory of the file from which this method is called.
See the __dir__
documentation, and "Why is __FILE__ uppercase and __dir__ lowercase?".
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