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https://issues.apache.org/jira/browse/IO-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726702#comment-17726702
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Miguel Munoz commented on IO-552:
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I should point out that the Javadocs includes lots of examples, but doesn't
include a single example where either parameter starts with a tilde:
{code:java}
/foo/ + bar --> /foo/bar
/foo + bar --> /foo/bar
/foo + /bar --> /bar
/foo + C:/bar --> C:/bar
/foo + C:bar --> C:bar [1]
/foo/a/ + ../bar --> /foo/bar
/foo/ + ../../bar --> null
/foo/ + /bar --> /bar
/foo/.. + /bar --> /bar
/foo + bar/c.txt --> /foo/bar/c.txt
/foo/c.txt + bar --> /foo/c.txt/bar [2] {code}
Regardless of how we solve this, we need to add some examples to cover this.
> 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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