When working remote from a DSL line with random disconnects or stupid 24 reconnects / ip address changes, or via unreliable mobile tethering, a screen/tmux sess

When working remote from a DSL line with random disconnects or stupid 24 reconnects / ip address changes, or via unreliable mobile tethering, a screen/tmux session saves you from accidentally killing important, long running jobs or missing important outputs, among other things.