tmux a / tmux attatch

• tmux a or tmux attach attach to last used session.
• tmux attach -t my_session_name or tmux attach-session -t my_session_name
• tmux attach -t 0 or tmux attach-session -t 0

See also

• tmux [ ls | a | new ], .tmux.conf, tlog, cockpit

https://medium.com/actualize-network/a-minimalist-guide-to-tmux-13675fb160fa