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https://issues.apache.org/jira/browse/IO-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772540#comment-17772540
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Elliotte Rusty Harold commented on IO-552:
------------------------------------------
In fact ~ is a legal character on Linux/Unix and ~abc.txt is a legal Unix
filename. You need to escape it in the shell, but non-shell APIs can and do use
it.
> FilenameUtils.concat fails if second argument (fullFilenameToAdd) starts with
> '~' (tilde)
> -----------------------------------------------------------------------------------------
>
> Key: IO-552
> URL: https://issues.apache.org/jira/browse/IO-552
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.2, 2.5
> Environment: Windows 7 64bit, JavaVM 1.8 32bit
> Reporter: Jochen Tümmers
> Priority: Critical
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> {{FilenameUtils.concat("c:/temp", "~abc.txt") returns "~abc.txt/" instead of
> "c:/temp/~abc.txt".}}
> As a result, the file would be created in the user's home directory instead
> of c:/temp.
> (Note: I Had to replace all instances of double backslashes that would
> normally appear in the java code with forward slashes as the editor cannot
> handle backslashes properly.)
> commons io 2.2. and 2.5 behave the same. 2.3 and 2.4 not tested.
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