Today I just used a command as below:

$ mv win_* *

and got an unexpected result.

Of course I had some folders named with 'win_*' under current directory,
such as 'win_core'. After the command is done, I can not find these folders
anywhere in the file system.

It is a bit confusing, the destination does not seem valid apparently but
the command is executed without any warnings, and unluckily, my files are
gone.

My OS: Ubuntu 13.04