Screen

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Permission denied when Starting Screen

When you are starting screen, and you are unable to create a screen session, and you have errors like

user1@node1 ~]$ screen
You are not the owner of /var/run/screen/S-user1

Check the permission of /var/run/screen/S-user1 to make sure you own the directory

$ chown user1:user1 /var/run/screen/S-user1
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Basic GNU Screen Usage on CentOS

Introduction

Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells. In other words, you can start any number of virtual terminals inside the session. The good thing is that processes running inside screen will continue to run even though the SSH session get disconnected.

GNU Screen Site

GNU Screen can be found on http://ftp.gnu.org/gnu/screen/

Source Code

You can get the source code from here

Using Screen

Screen can be easily installed on CentOS with just

# yum install screen

Naming a Named Session

You may be running many sessions and it is a good idea to name the session that you are starting.

screen -S your_preferred_screen_name

Listing running Screen Session

[user1@node1 ~]$ screen -ls
There is a screen on:
2109.myScreenA (Detached)
1 Socket in /var/run/screen/S-user1

Reattach to a Screen Session

To connect back to the screen, just type the numeric id of the screen

screen -r 2109

Detaching from a Screen Session

Inside the Virtual Session, you can detach the screen with the command

Ctrl-a + d

[Press ctrl with “a” and “d” together]
If you are already outside the virtual session, you can detach an active session by

screen -d 2109

Customised Screen

If you a looking at how to split Screen using screen. Here is a good visual guide.

To Terminate the Screen Session,

Enter into the Session screen

screen -r 2109
exit

 

User Guide

https://www.gnu.org/software/screen/manual/screen.html#Startup-Files

Links:

How To Use Linux Screen