(In reply to Marcus Meissner from comment #3) Compare with ~werner/bin/vscreen ... a script to start some serial consoles to be able to connect to host pipes from running VirtualBox instances: socat unix-connect:/dev/vboxtty/Factory,oobinline \ pty,link=/dev/vboxtty/PFactory,b38400,parenb=1,cs8,istrip=0,icanon=1 where /dev/vboxtty/PFactory points to e.g. /dev/pts/10 which then will be open by a running screen session.