Screen commands..

Screen commands:
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screen -ls :  This will list screen name and state
screen -ls  will show whether screen is in "detached" or "attached" state

To reattach "detached" screen : screen -r <screen name>

Leaving screen :   Press down ctrl + A together and type D (ctrl A + D)

When u type screen -ls if the screen is attached, then do the below

screen -D <screen name>
screen -r <screen name>

To enter a name for the screen : Screen -S test