Is there any way to have screen sessions that aren't visible via screen -ls command? If so, then what's the access method to these screens?
Any screen that is created by a screen -S <Name> will be shown in the output of screen -ls.
These locations mentioned in man screen could be of interest:
$SCREENDIR/S-<login>
/local/screens/S-<login> Socket directories (default)
/usr/tmp/screens/S-<login> Alternate socket directories.
Example:
% mkdir foo; chmod 0700 foo;
% SCREENDIR=$PWD/foo screen -S foo -d -m sleep inf
% screen -ls
No Sockets found in /var/folders/vy/t__dhyrs3d5dd_bvk6mj5t480000gn/T/.screen.
% SCREENDIR=$PWD/foo screen -ls
There is a screen on:
67294.foo (Detached)
1 Socket in /Users/muru/foo.
So, you could use different SCREENDIRs to keep separate sets of sessions.
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