Try this:
$ mkdir aux mkdir: `aux' exists but is not a directory
$ cat aux (hangs)
$ ./aux (hangs)
$ ls aux aux
$ rm aux $
http://cygwin.com/cygwin-ug-net/using-specialnames.html
Using (esp. unlinking) "NUL" and other special filenames is problematic. Use windows-special "\\.\" and "\??\" path-prefixes on Windows.
DEL \\.\c:\somedir\aux -- Reini Urban http://xarch.tu-graz.ac.at/home/rurban/
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