Bash script that add simulation of delay on localhost and remove it on exit

delay_localhost.sh

#!/bin/bash
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m'
set -e
function cleanup {
  echo -e "${RED}Removing delay from localhost"
  echo -e "-----------------------------${NC}"
  sudo tc qdisc del dev lo root netem
  sudo tc -s qdisc
  echo -e "${RED}-----------------------------${NC}"
}
trap cleanup EXIT
echo -e "${GREEN}Adding delay from localhost"
echo -e "---------------------------${NC}"
sudo tc qdisc add dev lo root netem delay 500ms
sudo tc -s qdisc
echo -e "${GREEN}---------------------------${NC}"
echo -e "Press ${RED}CTRL + C ${NC} to stop..."
while true; do sleep 1; done