timers.sh

#!/bin/sh
apptron app indicator - ./icon.png <<MENU |
Timers
	5 seconds
	10 seconds
	30 seconds
Say Hello
---
Quit
MENU
while read line; do
  case $line in
    "Say Hello")
      echo "Hello there!"
      ;;
    *)
      (sleep "${line%% *}" && 
        apptron shell notification "Timer" "$line")&
      ;;
  esac
done