Raji,
Most of the tasks which you do through a console can be accomplished through command line using wsadmin scripts. With wsadmin you can accomplish most of tasks like
1. Creating clusters
2. Creating cluster members
3. Defining Datasources/Queues/QCF's
4. Defining Websphere Variables
5. Defining Virtual hosts
6. Deploy applications.
7. Stop/Start JVM.
what i have defined above are just a few examples. I hope this gives you enough information and give an idea.