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https://issues.apache.org/jira/browse/IO-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601325#action_12601325
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Niall Pemberton commented on IO-171:
------------------------------------

Found this, which has a table indicating case sensitivity for file systems:
  http://en.wikipedia.org/wiki/Filename

Besides the OSX (HFS+) and VMS systems already mentioned the other 
case-insensitive file systems don't seem relevant anymore (i.e. Amiga*, PDP-11, 
RT-11)

So looks like OSX is in the same boat as VMS - may or may not be case-sensitive.

> IO assumes there are only two OSes: Windows and Unix
> ----------------------------------------------------
>
>                 Key: IO-171
>                 URL: https://issues.apache.org/jira/browse/IO-171
>             Project: Commons IO
>          Issue Type: Bug
>            Reporter: Sebb
>            Priority: Minor
>
> Just noticed that IO assumes systems are either:
> Windows-like:
> * File.separatorChar = \
> * Case-insensitive matching
> or
> Unix-like:
> * File.separatorChar = /
> * Case-sensitive matching
> It may well be true that there are only two different file sepator 
> characters, but it is not true that all non-Windows systems use 
> case-sensitive matching.
> For example, OpenVMS uses a file separator char of /, but originally only 
> supported case-insensitive file names (always shown as uppercase).
> Current versions of OpenVMS support both upper and lower-case; the default is 
> to use case-insenstive matching (and upper case names).
> Perhaps the IOCase.SYSTEM constant needs to have an "Unknown" or "Variable" 
> setting for this; it would then be an error to use IOCase.SYSTEM to determine 
> the case sensitivity.

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