Splitting Screens in Shell

Start a fresh screen

screen -S split

Split the current screen vertically or horizontally

ctrl+a+| or ctrl+a+S

Switch to a new screen

ctrl+a+<tab>

Spawn a new terminal in that screen

ctrl+a+c

Save this layout so you can safely detach and reattach later

ctrl+:layout save default

Close a new terminal and screen

ctrl+a+X