SSH is the Secure SHell, and it is widely used to remotely control computers from the command line. Here's a typical example of a connection to a remote computer via SSH:
VirtualBox users will have to use the port forwarding trick, and connect with a command similar to this:
ssh firstname.lastname@example.org -p 2222
See this link to find out how to enable and use port forwarding in VirtualBox.
Here's an introductory video on SSH. Enjoy!
Some commands on Linux:
- Check if an openssh server is running:
systemctl status sshd
- Install openssh server (on Debian):
apt install openssh-server
- Install openssh client (on Debian):
apt install openssh-client