VirtualBox allow you to run virtual machines on your computer. It is an Open Source software supported by Oracle.

https://www.virtualbox.org

Using Commandline

VirtualBox comes with command line tool VBoxManage.

To list all virtual machines on your computer, run

boby@hon-pc-01:~ $ VBoxManage  list vms
"OpenNebula-5.2-Sandbox-VBOX" {0c10ac37-ce93-4628-b899-84d1c880b447}
boby@hon-pc-01:~ $ 

To start virtual machine from command line, run

boby@hon-pc-01:~ $ VBoxManage startvm  0c10ac37-ce93-4628-b899-84d1c880b447
Waiting for VM "0c10ac37-ce93-4628-b899-84d1c880b447" to power on...
VM "0c10ac37-ce93-4628-b899-84d1c880b447" has been successfully started.
boby@hon-pc-01:~ $ 

To see list of running virtual machines

boby@hon-pc-01:~ $ VBoxManage list runningvms
"OpenNebula-5.2-Sandbox-VBOX" {0c10ac37-ce93-4628-b899-84d1c880b447}
boby@hon-pc-01:~ $