Start tmux at terminal start
ref: How can I set my default shell to start up tmux
if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ]; then
exec tmux
fi
Making TMUX use Alt+Num to select window
ref: Making TMUX use Alt+Num to select window
My preferred settings, create "~/.tmux.conf" and add setting as following:
bind-key -n M-1 select-window -t 0
bind-key -n M-2 select-window -t 1
bind-key -n M-3 select-window -t 2
bind-key -n M-4 select-window -t 3
bind-key -n M-5 select-window -t 4