Handling bash Signals events for program interruptions or a simple kill

signals.sh

#!/bin/bash

# traps (look for the ocurrence of something - event, commands, signals -> redirect reaction) and signals

clear

# what to do, what is it we are traping
trap 'echo " - Please Press Q to Exit ..."' SIGINT SIGTERM SIGTSTP # interrupt or simple kill

while [ "$CHOICE" != "Q" ] && [ "$CHOICE" != "q" ]; do
  echo "Main Menu"
  echo "========="
  echo "1) Choice One"
  echo "2) Choice Two"
  echo "3) Choice Three"
  echo "Q) Quit/Exit"
  echo ""
  read CHOICE # evaluate the choice option

  clear
done

# the trap message will appear after CTRL+ C
# ps aux | grep [file]
# bg [Pid] -> suspend the execution of that script -> in anticipation will apply some message (not running anymore)
# kill -9 [Pid] -> killing from kernel - cannot be traped