Simple bash script that allows to block sites

distract.command

#! /bin/bash
# Add websites to block below, separated by spaces and inside the parentheses:
declare -a websitesToBlock=("reddit.com" "youtube.com" "x.com" "twitter.com" "linkedin.com")
# Set block time in minutes (change this value as needed)
BLOCK_TIME_MINUTES=30

unblock_sites() {
  sudo sed -i '' '/#start-Blocking/,/#stop-Blocking/d' /etc/hosts
  echo "Unblocking websites now!"
  echo "Thanks for using my script :)"
  exit 0
}

if [ "$1" = "unblock" ]; then
  unblock_sites
fi

if [ "$1" = "unblock-site" ]; then
  SITE_TO_UNBLOCK="$2"
  if [ -z "$SITE_TO_UNBLOCK" ]; then
    echo "Usage: $0 unblock-site <site>"
    exit 1
  fi
  sudo sed -i '' "/127.0.0.1 $SITE_TO_UNBLOCK/d" /etc/hosts
  sudo sed -i '' "/127.0.0.1 www.$SITE_TO_UNBLOCK/d" /etc/hosts
  sudo sed -i '' "/fe80::1%lo0 $SITE_TO_UNBLOCK/d" /etc/hosts
  sudo sed -i '' "/fe80::1%lo0 www.$SITE_TO_UNBLOCK/d" /etc/hosts
  echo "$SITE_TO_UNBLOCK has been unblocked."
  exit 0
fi

if [ "$1" != "block" ]; then
  echo "Usage: $0 [block|unblock|unblock-site <site>]"
  exit 1
fi

clear
echo "This script will block distracting websites for $BLOCK_TIME_MINUTES minutes."
timeToBlock=$((BLOCK_TIME_MINUTES * 60))
echo "To ensure a complete block, administrator rights will be needed!"
echo "DO NOT modify the hosts file while this script is running or bad things will happen!"
sudo cp /etc/hosts hosts.bak
while true; do sudo -n true; sleep 60; kill -0 "$$" || exit; done 2>/dev/null &
clear
echo "Making a backup of the hosts file to the current directory..."
echo "DO NOT CLOSE THE PROGRAM NOW OR THE WEBSITES WILL BE REMAINED BLOCKED."
echo "Blocking Distractions..."
sudo -- sh -c "echo '#start-Blocking' >> /etc/hosts"
for i in "${websitesToBlock[@]}"
do
    sudo -- sh -c "echo '127.0.0.1 $i' >> /etc/hosts"
    sudo -- sh -c "echo '127.0.0.1 www.$i' >> /etc/hosts"
    sudo -- sh -c "echo 'fe80::1%lo0 $i' >> /etc/hosts"
    sudo -- sh -c "echo 'fe80::1%lo0 www.$i' >> /etc/hosts"
done
sudo -- sh -c "echo '#stop-Blocking' >> /etc/hosts"
echo "Successfully blocked distractions! It's time to work now..."
echo "Websites will be unblocked automatically in $BLOCK_TIME_MINUTES minutes. You may close this terminal."
nohup bash -c "sleep $timeToBlock; $(which sudo) sed -i '' '/#start-Blocking/,/#stop-Blocking/d' /etc/hosts" >/dev/null 2>&1 &
exit 0

source credits: https://github.com/najeemk/distractions-blocker

added modifications to suit me on top of that.