linux debian HOW TO DISCONNECT AND RECONNECT TO A SHELL SESSION keep programs/commands running even when you log off run a program persistently (even if a terminal window closes, for example).

For that, you might use the nohup command. But what if you want to start a command-line session on one computer and then go home and resume that session?

For something like that, you’ll want to use screen. Screen is also really handy because you can have multiple shells running in one terminal window. Here’s the basics of how to use screen on a Linux/Ubuntu machine. First,

create a session:

screen -S sessionname

It’s good to choose a descriptive session name. For example, before I switched to using Gmail I used mutt. So I would often start a session with the command “screen -S mutt” in one terminal window. If I went home, I could attach to that session from home, so I never needed to start-up or shutdown mutt.

You can easily have 10 interactive shells (numbered from 0 to 9) open in one terminal window. When you start a new session, you’ll be in shell 0. To create a new shell To create a new interactive shell, press Control-a c Switching between shells is easy too. To switch between shells press Control-a # where # is the number of the shell.

resume session:

screen -d -R sessionname

will resume a session that you started in a different location. Technically this command is doing some special things. If you started the session somewhere else, the “-d” option will “detach” it at the other location, and “-R” will reattach your current terminal window to the session. If sessionname hasn’t been created, it will create the session for you. So the command above will migrate a session to your current window and disable the session at other locations. That’s usually what you want. To exit a session, it’s easiest to exit all the shells in the session. If you want some more info on screen: Control-a ? will give help inside of screen.
Typing “man screen” at a Linux command-line will show more help on screen.
There are web pages with more info on screen.

credits: http://www.mattcutts.com/blog/a-quick-tutorial-on-screen/

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