gistfile1.sh

if tmux has 2>/dev/null; then
  echo "tmux sessions found:"
  tmux ls
  echo
  echo -n "Attaching to default tmux session in 5 seconds. Press Ctrl-C to abort"
  for ((i=5; i>0; i--))
  do
    printf "."
    if read -s -t 1 -k ; then break; fi
  done
  tmux attach
else
  echo -n "Starting new tmux session in 3 seconds (Ctrl-C to abort)."
  sleep 3
  tmux new
fi