i cant run any command in ubantu

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http://askubuntu.com – i tried following command (nano ~/.bashrc) in order to include some path in .bashrc file in home directory but m not able to run any command and always getting following error rag@rag-Satellite-C640:~$ nano ~/.bashrc Command 'nano' is available in the following places * /bin/nano * /usr/bin/nano The command could not be located because '/usr/bin:/bin' is not included in the PATH environment variable. nano: command not found why this is happening with any command i try? i want to edit .bashrc file ..some1 please help me (HowTos)