The documentation is quite clear about how to use this command, Instead of asking about whole command, tell us what you did not understand, no one is going to tell you the things which are available easily.
Sorry to be rude, but first search for this command seriously and then in case on any implementation issue, post the query here.
Quality Assurance Lead, India
"A Cat looked at the mirror and what she saw was a Lion. Secret of success depends on how you see yourself."