"tmux attach-session -t 0" is a lot to type when "tmux attach 0" would be just as understandable tbqh
@tom I personally have this in my .profile:
if [ -z "$TMUX" ]; then tmux attach -d; fi
That way, it tries to reconnect automatically (and disconnect everything else from it, which is important because I connect from differently sized terminals). If there isn't a running tmux, I just have to issue tmux to get one.