When performing a long interactive operation such as a complex test or build over a remote connection (such as SSH), any network interruption such as a temporary break in WiFi connectivity or relocating from one pace to another will interrupt the operation and force you to start over.
GNU screen is a utility which addresses this problem by enabling you to disconnect from a terminal session and reconnect from the same or a different location later. It also has a number of advanced features such as multiple sessions over a single connection and session sharing between multiple users. This tutorial covers the most basic and useful use-case.
- Connect to a system, either by logging in locally or logging in remotely via SSH.
- Start screen:
-RaDoptions tell screen to start a session if none exists, or take over an existing session is one does exist, and to detach any existing remote connections to that session.
- Perform whatever operations you desire.
- Disconnect by pressing Ctrl-A then D.
- You can now disconnect/close your local login or ssh connection.
- To resume from the same or other location, issue the command from step 2.
For additional details, see the manpage for screen.
An alternative to screen is tmux.
For a similar disconnect/reconnect capability for graphical applications, see https://en.wikipedia.org/wiki/Virtual_Network_Computing VNC].