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There are a bunch of useful commands to use from Mongo CLI (accessible by typing mongo in your favorite favourite terminal).

• show dbs
  prints out all databases.
• show collections
  prints out all collections in a database (you'll need to use a_particular_database first).
• db.entity.find()
  this will print out all documents in entity collection. Not very useful if there are many as it prints out just a few (you'll notice "has more" at the end).
• db.entity.find({_id : /User.*/})
  db.entity.find({_id: { $regex: 'User.*', $options: 'i' } } )
  regular expression finder. Expression between / and / is a regular expression, use Use your imagination to narrow your search.
  (first example may not work on CLI 2.0.7)
• db.entity.find({ent:"user"})
  instead of regex you may find all entities of a particular type using ent field. This field is the java class name in lower case.
• db.entity.find({type:"openacdskill", name:"German"})
  narrow the search by applying multiple "filters".
• db.entity.drop()
  drop the entire entity collection.
• db.entity.find({uid:"200"})
  find a particular user document. User names are held in the uid field.
• db.entity.find({uid:"200"}).forEach(function (d) {printjson(d)})
  prints out a formatted version of the document. Pretty useful when looking at a single document. You can also use: db.entity.find({uid:"200"}).forEach(function (d) {printjson(d.prm)}) to see a formatted version of the prm field (permissions).
• db.entity.find({uid:"200"}).forEach(function (d) {print("_id: "+ d._id +"; perms: "+d.prm)});
  print out just a few fields from a particular document

More: http://docs.mongodb.onconfluence.com/display/DOCS/Advanced+Queriesorg/manual/reference/operators/