Ruby/File Directory/dev

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dev_major Returns the major part of File::Stat#dev or nil if the operating system doesn"t support this feature.

puts File.stat("testfile").dev_major



dev_minor Returns the minor part of File::Stat#dev or nil if the operating system doesn"t support this feature.

File.stat("testfile").dev_minor



dev Returns an integer representing the device.

File.stat("testfile").dev
"%x" % File.stat("testfile").dev
Источник — «http://wiki.crossplatform.ru/index.php/Ruby/File_Directory/dev»