using mongo db shell code example

Example 1: mongo shell commands

show dbs # <=> Print a list of all databases on the server.
use <db> # <=> Switch current database to <db>
show collections # <=> Print a list of all collections for current database.
db.people.insert({name:"Ashwin",gender:"m"}) # <=> Inserts a new "person" collection with a new object in that collection
db.people.find(<any attributes or none>) # <=> Find all persons in the collection
db.people.update({name:"Ashwin"},{gender:"f"}) # <=> Updates the selected (1st parameter) person with new value(2nd parameter)
db.people.remove({name:"Ashwin"}) # <=> Remove where name is "Ashwin"
db.people.drop() # <=> Delete the "people" collection

Example 2: start mongodb in terminal

Start a terminal for your mongo server
Go to <mongodb-install-directory>/bin directory
Run the command./mongod
Start a terminal for your mongo shell
Go to <mongodb-install-directory>/bin directory
Run the command (make sure you put the name of the database)./mongo test