// Show current database
db

// Select or switch database
use mydb

// Execute a JavaScript file
load(myscript.js)

// Display help
help

// Display help on DB methods
db.help()

// Display help on Collection
db.mycol.help()

// Show all databases
show dbs

// Show all collections in current database
show collections

// Show all users on current database
show users

// Show all roles on current database
show roles