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Date: Mon, 1 Mar 2010 21:48:00 -0600
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Subject: How to delete a file without owner and group?
From: Peng Yu <pengyu.ut@gmail.com>
To: cygwin@cygwin.com
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I have a file that doesn't have owner and group and hence I can not
delete it. Could somebody let me know how to delete it?

office@office-PC /tmp
$ ll
total 0
-rw-r--r-- 1 ???????? ???????? 0 2009-11-28 10:12 foo.sh

office@office-PC /tmp
$ chown office foo.sh
chown: changing ownership of `foo.sh': Permission denied

office@office-PC /tmp
$ rm foo.sh
rm: remove write-protected regular empty file `foo.sh'? y
rm: cannot remove `foo.sh': Permission denied

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