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What determines the encoding of a File # path?

In ruby ​​1.8.7, what determines what File#path will encode? File system? Configuration somewhere? Encoding of each individual file?

I saw two different encodings in other identical environments on different OS.

Related questions: Reading a file name in several OSs without a problem with Ruby encoding

Update

I think I need to set / know the encoding of the file system ... this does not help though (unless I put it in the wrong place) ...

  export LC_ALL = en_US.UTF-8
 export LC_CTYPE = en_US.UTF-8
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Theoretically, you can read system coding from

 ENV['LC_LANG']

and you can set it in the same way for ruby ​​script:

 ENV['LC_LANG']=en_US.UTF-8

The same applies to other environment variables for a particular encoding.

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