[Answered ]-I have installed virtualenvwrapper but getting error- workon: command not found

I think you may have installed virtualenvwrapper inside any virtual enviroment like this-

 rahul@rahulpc:~/mydjangoapp$ source jango/bin/activate
(jango)rahul@rahulpc:~/mydjangoapp$ pip install virtualenvwrapper

So before installing virtualenvwrapper you have to deactivate virtual enviroment.

(jango)rahul@rahulpc:~/mydjangoapp$ deactivate
rahul@rahulpc:~/mydjangoapp$ pip install virtualenvwrapper

now follow all further steps.