Ruby 脚本能告诉你它在哪个目录吗？

受“ 从内部获取 Bash 脚本的源目录”的启发，Ruby 做这件事的方法是什么？

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最佳答案

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.

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ENV["PWD"] seems the simplest way for me under Linux. I don't know of an OS-agnostic way.

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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?".

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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

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