Use screen Command To Create Multiple Terminal Sessions

pradeep's Avatar author of Use screen Command To Create Multiple Terminal Sessions
This is an article on Use screen Command To Create Multiple Terminal Sessions in Unix.
The GNU/Linux screen program is quite unknown, except for geeks & *nix experts, it helps you create multiple terminal sessions from a single one and lets you detach from the screen, at the same time maintaining the sessions as if you had never left the session and you can attach/connect to the session anytime you want afterwards.

Another feature of the screen program is that it allows multiple people to use the same sessions, thereby providing a terminal session 'sharing' feature. In this article we'll be looking into using screen to create and manage multiple sessions.

Using screen Command



First let's look at starting a screen session, it can be simply started with,

Code:
$ screen

but, that will have a arbitrary screen session name chosen by the screen program. So, this would be more suited,

Code:
$ screen -S my_tail_log

This will immediately start a new session and attach it, in case you want to start a screen in detached mode, useful for startup scripts, try this

Code:
$ screen -dm -S my_tail_log

To resume a detached screen,

Code:
$ screen -r my_tail_log

To attach to an already attached running screen (say for sharing, multiple users can attach to the same session)

Code:
$ screen -x my_tail_log

To create a new window inside a screen when attached to it, use Ctrl + A and then C.

To view the list of running windows in a screen and select one from the list, use Ctrl + A and then ".

To change a window's title, use Ctrl + A and then capital A.

To detach from a screen, use Ctrl + A and then D.

To list all the running screens,

Code:
$ screen -ls

You can use multiple windows inside a screen to work on different things, say one for editing code, another for executing the programs, and another one to view logs/debugging etc. It's very easy to share working while on a teleconferencing call and all users can see, execute & discussion commands and outputs.