Tmux shells from script

multiple-tmux.sh

#!/bin/sh
tmux new-session -d -s work1 'cd a/b/c';       # start new detached tmux session, run htop
tmux split-window;                             # split the detached tmux session
tmux send 'cd /d/e/f' ENTER;                   # send 2nd command 'htop -t' to 2nd pane. I believe there's a `--target` option to target specific pane.
#tmux a;        
tmux new-session -d -s work2 'htop';
# default vertical / -h horizontal
tmux split-window -h;                   
tmux send 'a/b/c/myscript.sh' ENTER;
tmux a;