Using SSH for Remote Access
SSH (Secure Shell Protocol) gives remote access to remote computer. In its basic form it allows the execution of command lines in a terminal, if the remote machine is running an SSH server. It can also be used for remote graphical user interfaces.
Connecting to an SSH Server
For connecting to a remote machine, it needs to run an SSH server. On the client side, an SSH connection can be established without additional installations from the terminal on Linux and MAC machines and - since version 10 - from Windows. SSH receives the following command, with the remote user's credentials (username and ip-address). This user needs to be installed on the remote machine. The remote SSH server will ask for the user's password, if no SSH key has been installed.
$ ssh username@address
X11 Forwarding
X11, or the X Window System is a framework for a graphical user interface (GUI) environment, used on Unix systems.
With X11 Forwarding, SSH can also be used to run applications with a GUI, remotely.
When connecting to an SSH server from a Linux machine, simply add the -X argument to do so:
$ ssh -X username@address
X11 On Mac
On Mac you need to install xqwartz <https://www.xquartz.org/> to enable X11 Forwarding.
Afterwards, the -X argument will enable X11 Forwarding:
$ ssh -X username@address
X11 on Windows
Although SSH will be possible from Windows' builtin Power Shell or Windows Terminal, X11 Forwarding requires Putty and additional tools:
install putty
install vcxsrv
enable X11 in Putty