I was sorta guessing ... but now I looked into the code:
For VMS, W32, Mac and OS2 '$volume' means something like drive e.g. 'C:'
as for Unix its not implemented at all and always returns ''
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I would not say it's "not implemented". There is simply no such concept of a special volume part in a Unix filename (which is a good thing, IMHO).
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Yes, in the filename it's not, but in the file there is (otherwise the question would be meaningless). Therefore it should be part of File::Spec.
Please observe that the module isn't called FileName::Spec or
File::Name.
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