"permission denied" issues when removing files/folders created by cygwin

Roger Pack rogerdpack2@gmail.com
Thu Sep 3 15:10:00 GMT 2015


On 9/1/15, Corinna Vinschen <corinna-cygwin@cygwin.com> wrote:
> On Sep  1 13:05, Michael Enright wrote:
>> On Tue, Sep 1, 2015 at 12:48 PM, Roger Pack  wrote:
>> > It appears the problem lies with creating a file named "NUL" windows
>> > utilities just don't know how to deal with it (you can recreate it by
>> > creating a folder, then from cygwin bash $ touch NUL) then try and
>> > remove the folder with windows explorer.
>>
>> The utilities "know" how to deal with it, given their design:
>> http://blogs.msdn.com/b/oldnewthing/archive/2003/10/22/55388.aspx
>
> And then there's
>
> https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-dosdevices
>
> You can create and delete those files even in CMD, btw.  You just have
> to use the long pathname prefix "\\?\", e.g.:
>
>   bash$ cmd /c 'echo foo > \\?\c:\cygwin64\home\corinna\nul'
>   bash$ ls -l nul
>   -rwxr-xr-x 1 corinna vinschen 6 Sep  1 22:30 nul
>
> delete with
>
>   bash$ rm nul
>
> or
>
>   bash$ cmd /c 'del \\?\c:\cygwin64\home\corinna\nul'

Yeah this works.  Windows explorer is not as clever unfortunately, so
lay users would find trouble here (my particular case is they install
a local copy of cygwin which cross compile's something for them--no
knowledge of cygwin required--but then suddenly they find they cannot
remove folders through any easy means...)
Cheers!

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