Just for future record, the script I actually use has two returns at the end of the send-keys lines tmux send-keys -t cal:0 'calcurse' ^M ^M tmux sen

Just for future record, the script I actually use has two returns at the end of the send-keys lines tmux send-keys -t cal:0 'calcurse' ^M ^M tmux send-keys -t cal:1 'calcurse $Week' ^M ^M tmux send-keys -t cal:2 'calcurse $Month' Enter Enter