CentOS 7.x screen

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CentOS 7.x screen

It is useful to run commands in screen so that we can later connect our ssh to machines and continue monitoring the progress. Refer: http://www.linuxcommand.org/lc3_adv_termmux.php for useful terminal multiplexing options such as screen or tmux or byobu.

Install screen

To install screen use:

   yum -y install screen

Start new screen session

To start new screen session use:

   screen   

After this use the screen terminal like any other linux terminal.

To give a meaningful name to session use '-S' such as

   screen -S <name>

This name can be later used to identify screen.

You can start multiple virtual screens within a screen. To start a new virtual screen use:

• 'Ctrl-A c'

shortcut. That is press Ctrl-A and leave both Ctrl and A, then press 'C'.

If you do use virtual screens then following additional shortcuts would help:

• 'Ctrl-A p' - Go to previous virtual screen
• 'Ctrl-A n' - Go to next virtual screen
• 'Ctrl-A A' - Set title for current screen
• 'Ctrl-A "' - List all screens and select them by title
• 'Ctrl-A [0-9]' - Go to particular virtual-screen

Stop current screen session

To stop current screen session simply exit from bash screen

   exit

To list running screens

To list running screens use:

   screen -ls 

This will give screen session IDs of all running screen sessions

To disconnect current screen from terminal

To disconnect screen while you are connected to it use shortcut

• 'Ctrl-A D'

That is press Ctrl-A and leave both Ctrl and A, then press 'D'.

To disconnect running screen from terminal wherever it is running use:

   screen -d <screen-session-ID>

To connect to a running screen

To connect to a running screen use below. If required below command will detach anyone connected to mentioned screen and would connect the person executing the command to the screen.

   screen -r -d <screen-id> 

To create or connect to screen with name

To connect to an existing screen or create one if does not exists with name use:

   screen -d -RR <name>

This way if screen with <name> exists, you will get connected to it. If screen does not exists then it would be created.

Read 'man screen' for more information

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