I am getting the below error

hadoopuser@sherin-VirtualBox:~$ sudo systemctl status mongod
[sudo] password for hadoopuser:
● mongod.service - High-performance, schema-free document-oriented database
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2018-05-27 13:18:14 IST; 1min 48s ago
Docs: https://docs.mongodb.org/manual
Main PID: 940 (mongod)
CGroup: /system.slice/mongod.service
└─940 /usr/bin/mongod --quiet --config /etc/mongod.conf

May 27 13:18:14 sherin-VirtualBox systemd[1]: Started High-performance, schema-free document-oriented database.
hadoopuser@sherin-VirtualBox:~$ SHOW DBS
SHOW: command not found
hadoopuser@sherin-VirtualBox:~$ show dbs
The program 'show' can be found in the following packages:

• mailutils-mh
• nmh
  Try: sudo apt install <selected package>
  hadoopuser@sherin-VirtualBox:~$ db
  db: command not found
  hadoopuser@sherin-VirtualBox:~$