oh-my-bash/plugins/tmux-autoattach/README.md

tmux plugin

The tmux plugin will either attach or create a new tmux session for each bash session. If a session already exists, it will simply attach.

OSH_PLUGIN_TMUX_AUTOATTACH_BEHAVIOR

| exit | This will completely close out your shell session, including your terminal, but keep your tmux sessions intact. This will also close your session if you detach. | | detach | This will allow you to detach from the tmux screen without closing the terminal or shell session. |