The two most productivity increasing Bash functions ever written.

productivity.sh

function worktime {
  echo "# WORKTIME" | sudo tee -a /etc/hosts > /dev/null
  while read -r line; do
    echo "127.0.0.1 ${line}"
  done < $HOME/.blocked_sites | sudo tee -a /etc/hosts > /dev/null
}

function slacktime {
  flag=0
  while read -r line; do
    [[ $line =~ "# WORKTIME" ]] && flag=1
    [[ $flag -eq 1 ]] && continue
    echo $line
  done < /etc/hosts > /tmp/hosts

  sudo cp /tmp/hosts /etc/hosts
}

Cool stuff! I also added a block and an unblock function (I am super lazy!)

Also, add this to your sudoers-file to avoid typing your password every time you switck to workmode/slackmode:

username ALL=(root) NOPASSWD: /usr/bin/tee -a /etc/hosts
username ALL=(root) NOPASSWD: /bin/cp /tmp/hosts /etc/hosts

@shime You have to set up a local Webserver listening on Port 80, serving said landing page.