Linux – How to use crontab to start a screen session

Tell screen to be a bit more persistent about trying:

-D -R
    Attach here and now. In detail this means: If a session is run-
    ning,  then  reattach.  If necessary detach and logout remotely
    first.  If it was not running create it and  notify  the  user.
    This is the author's favorite.

So combine the two and you should have your solution ("-DR" is equivalent to "-D -R"):

screen -DR <yoursession> 

Additionally and useful to know, you can view running sessions with:

screen -ls

I think you may be running into several issues.

If the command finishes before you re-attach, the screen will go away. You can demo this by using:

screen -d -m ls -l

It will run the ls -l command, but screen -list won't show it as the screen process has ended.

I also have no idea what you are trying to do with this \015 stuff. Perhaps updating your question would help, as what I think you're trying to do is run multiple commands in a screen session. This should be as simple as:

screen -d -m bash -c "command1 ; command2 ; command3"

If these are used a lot, perhaps you should make a shell script that runs just these commands, then use a more simple:

screen -d -m /path/to/script.sh