- Share a screen session: \\ in one terminal <code bash> screen -S SharedSession </code> in another terminal <code bash> screen -x SharedSession </code> :!: Require same user.\\ See [[https://www.howtoforge.com/sharing-terminal-sessions-with-tmux-and-screen]] for more details and tmux examples
  - Logging: \\ To save everything that is in your screen session, at the beginning: <code>Ctrl + a + h </code>
  - Detach a screen inside a screen:<code>Ctrl + a + a + d</code>
  - Serial console: <code bash> screen /dev/ttyS0 19200</code>

==== Upgrading system ====
Network might goes down while full system upgrade
<code bash>ssh -t machine.to.update screen -d -R -S Upgrade</code>
If it goes down, same command reconnects to the screen session "Upgrade"

====== CheatSheet ======
Here's a quick cheatsheet for GNU Screen with start/reconnect commands and main key bindings:

===== Starting and Reconnecting =====


==== Start a new screen session: ====

<code>screen</code>


==== Start a named screen session: ====


<code>screen -S session_name</code>


==== Reconnect to a detached session: ====


<code>screen -r</code>


==== List running sessions: ====


<code>screen -ls</code>


==== Reconnect to a specific session: ====


<code>screen -r session_name</code>


===== Main Key Bindings (defaults) =====


All commands are prefixed with `Ctrl+a` (denoted as `C-a` below)

==== Window Management: ====

   * `C-a c`: Create a new window
  * `C-a n`: Switch to next window
  * `C-a p`: Switch to previous window
  * `C-a 0-9`: Switch to window 0-9
  * `C-a "`: List all windows
  * `C-a A`: Rename current window

==== Session Management: ====

  * - `C-a d`: Detach from current session
  * - `C-a x`: Lock the screen session

Split Screen:
  * `C-a S`: Split display horizontally
  * `C-a |`: Split display vertically
  * `C-a tab`: Switch between regions

Copy Mode:
  * `C-a [`: Enter copy mode
  * `C-a ]`: Paste from copy buffer

Other Useful Commands:
  * `C-a ?`: Show help
  * `C-a a`: Send `Ctrl+a` to the current window
  * `C-a k`: Kill current window
  * `C-a \`: Kill all windows and terminate screen

Remember that you can customize these bindings in your `~.screenrc` file to suit your preferences.




References:
  * https://www.rackaid.com/blog/linux-screen-tutorial-and-how-to/
  * https://www.howtoforge.com/sharing-terminal-sessions-with-tmux-and-screen
  * http://www.computerhope.com/unix/screen.htm
  * https://aperiodic.net/screen/interface
  * https://stackoverflow.com/questions/8353470/gnu-screen-custom-key-bindings-format
  * https://wiki.archlinux.org/title/GNU_Screen
  * https://www.gnu.org/software/screen/manual/html_node/Default-Key-Bindings.html
  * https://www.gnu.org/software/screen/manual/html_node/Key-Binding.html
  * https://opensource.com/article/17/3/introduction-gnu-screen
  * https://web.mit.edu/gnu/doc/html/screen_13.html
  * https://tonisagrista.com/blog/2021/gnu-screen-cheatsheet/