'screen' is a linux utility that enables you to open multiple sessions without multiple ssh login to same remote server. for example, you have logged into a remote server, and you run a command in forground, and now you want to run another command simultaneously, you will have to open another remote session by logging in again. this can be avoided by using 'screen' that if you run on the remote terminal, it will launch another remote prompt within the same terminal.
install:
apt-get install screen // ubuntu
login to remote server:
ssh xyz@remoteServer
$screen
commands to switch between two prompts:
Ctrl+a c Create new window
Ctrl+a k Kill the current window / session
Ctrl+a w List all windows
Ctrl+a 0-9 Go to a window numbered 0 9, use Ctrl+a w to see number
Ctrl+a Ctrl+a Toggle / switch between the current and previous window
Ctrl+a S Split terminal horizontally into regions and press Ctrl+a c to create new window there
Ctrl+a :resize Resize region
Ctrl+a :fit Fit screen size to new terminal size. You can also hit Ctrl+a F for the the same task
Ctrl+a :remove Remove / delete region. You can also hit Ctrl+a X for the same taks
Ctrl+a tab Move to next region
Ctrl+a D (Shift-d) Power detach and logout
Ctrl+a d Detach but keep shell window open
Ctrl-a Ctrl-\ Quit screen
Ctrl-a ? Display help screen i.e. display a list of commands
