Linux Screen - NexonHost.com

How To Use Linux Screen.Screen or GNU Screen is a terminal multiplexer. In other words, it means that you can start a screen session and then open any number of windows (virtual terminals) inside that session. Processes running in Screen will continue to run when their window is not visible even if you get disconnected. Install Linux GNU ScreenThe screen package is pre-installed on most Linux distros nowadays. You can check if it is installed on your system by typing:screen --versionScreen version 4.01.00devel (GNU) 2-May-06How to install screen.sudo apt updatesudo apt install screenInstall Linux Screen on CentOS and Fedorasudo yum install screenStarting Linux ScreenTo start a screen session, simply type screen in your console:screenThis will open a screen session, create a new window, and start a shell in that window.Now that you have opened a screen session, you can get a list of commands by typing:Ctrl+a ?Starting Named SessionNamed sessions are useful when you run multiple screen sessions. To create a named session, run the screen command with the following arguments:screen -S session_nameIt’s always a good idea to choose a descriptive session name.Working with Linux Screen WindowsWhen you start a new screen session, it creates a single window with a shell in it.You can have multiple windows inside a Screen session.To create a new window with shell type Ctrl+a c, the first available number from the range 0...9 will be assigned to it.Below are some most common commands for managing Linux Screen Windows:Ctrl+a c Create a new window (with shell).Ctrl+a " List all windows.Ctrl+a 0 Switch to window 0 (by number).Ctrl+a A Rename the current window.Ctrl+a S Split current region horizontally into two regions.Ctrl+a | Split current region vertically into two regions.Ctrl+a tab Switch the input focus to the next region.Ctrl+a Ctrl+a Toggle between the current and previous windowsCtrl+a Q Close all regions but the current one.Ctrl+a X Close the current region.Detach from Linux Screen SessionYou can detach from the screen session at any time by typing:Ctrl+a dThe program running in the screen session will continue to run after you detach from the session.Reattach to a Linux ScreenTo resume your screen session use the following command:screen -rIn case you have multiple screen sessions running on your machine, you will need to append the screen session ID after the r switch.To find the session ID list the current running screen sessions with:screen -lsThere are screens on: 10835.pts-0.liviu-test-desktop (Detached) 10366.pts-0.liviu-test-desktop (Detached) 2 Sockets in /run/screens/S-liviu-test.If you want to restore screen 10835.pts-0, then type the following command:screen -r 10835Customize Linux ScreenWhen screen is started, it reads its configuration parameters from /etc/screenrc and ~/.screenrc if the file is present. We can modify the default Screen settings according to our preferences using the .screenrc file.Here is a sample ~/.screenrc configuration with customized status line and few additional options:~/.screenrc# Turn off the welcome message startup_message off # Disable visual bell vbell off # Set scrollback buffer to 10000 defscrollback 10000 # Customize the status line hardstatus alwayslastline hardstatus string '%{ kG}'Basic Linux Screen UsageBelow are the most basic steps for getting started with screen:On the command prompt, type screen.Run the desired program.Use the key sequence Ctrl-a + Ctrl-d to detach from the screen session.Reattach to the screen session by typing screen -r.ConclusionIn this tutorial, you learned how to use Gnu Screen. Now you can start using the Screen utility and create multiple screen windows from a single session, navigate between windows, detach and resume screen sessions and personalize your screen terminal using the .screenrc file.

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