Brainless method I use to check the panel:

  case $1 in
  ""|-b|-E|-S|-t)
  tmux capturep $@ --;
  tmux showb $@ --;
  exec tmux dele --;
  esac

Also there is a "-N repeat count" option for send-keys in newer versions of tmux.

capture-pane has -p so you can pipe its output rather than letting it create a buffer you have to delete.

s/has/now &/

I started using tmux in 2009. There was no -p option when capturep command was first added. Old scripts that keep working tend not to get updated. I have updated it now. Thank you.