Screen is great for long running tasks, where you want to log in every few hours and days and keep your session alive indefinitely.

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To create a new screen, do

screen -Rd screenname

This will also reattach an existing screen with that name.

Once you're in the screen, CTRL+A will bring up the menu, d detaches the screen. You can close your shell, screen and all applications running inside of it will remain alive.

Scrolling inside a screen

• Bring up the menu with CTRL+A
• Press Esc
• You can now scroll with Page up/Page down
• Esc takes you back again