Mongo CLI

List the databases:

show dbs

Create/use a database:

use database name

See collections inside a database:

show collections

Count values inside the collection:

db.collectionname.count()

See data inside the collection:

db.collectionname.find()

To see proper JSON formatted data:

db.collectionname.findOne()

To remove an entry from the mongodb:

db.collectionname.remove({'key': 'value'})

eg.

db.actions.remove({'workflow': 'cmsunified_ACDC0_task_B2G-RunIIFall17wmLHEGS-02050__v1_T_191029_073632_8054'})