Using the Linux Screen Command

Jul 6th, 2015

I use Digital Ocean for hosting many different Linux servers that I have: longeststreak.net, this website, a private Discourse forum, a private minecraft server, and one I use for programming (the one I'm using right now to write this post). The point I'm getting at is that I end up SSH'ing into these boxes a lot and one tool that I use every time is the screen command.

Screen allows you to connect back to the exact same terminal you were on in case your connection got lost while writing in vim. Another example is so that you can start a process like minecraft and not have to use the & symbol for it to run in the background.

Screen also allows you to create windows so that if you need another shell on the same box you don't have to ssh in again.

Here are the screen commands that I use most often:

• screen - starts a new screen session
• ctrl-a d - detaches from screen
• screen -ls - shows a list of screen sessions
• screen -D - detach an active screen (necessary if you connection is lost and you are SSH'ing back into the box)
• screen -r - re-attach to screen session
• ctrl-a c - create a new screen window
• ctrl-a n - switch between screen windows

The point of this post is not to give an exaustive tutorial on screen, but to make you aware that it exists and give you a few commands to help you get started. If you aren't using screen yet I hope you can start.