I haven't done anything with my macbook pro but it is running in MS-Dos environment. In what kind of situation this can happen.

Hi, has anyone have the problem that you haven't done anything with you macbook pro but its operating system is running in dos environment?

Do you have Windows installed? 
No? Then it can't be running in DOS. (Disk Operating System)
Mac's run BSD Unix, not DOS. however single user mode looks like DOS.
If you booted the Mac holding the command and s keys, that's single user mode, which is the root level command line.
type exit or reboot or restart (one of those should work) and press enter, then reboot normally or load OS X.
If it's always entering this enviroment, then something is set on it to do that.
It's possible to set the machine to display this mode upon boot, but once OS X is loaded it should disappear.

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