screenの中でしかapt upgradeできないようにする

restrict_apt_upgrade.sh

# write this in /etc/bash.bashrc to cannot "apt upgrade" not in screen
apt() {
  if [[ $@ == "upgrade" ]]; then
    if [ -n "$STY" ]; then
      command apt "$@"
    else
      echo 'you should apt upgrade in "screen -R"'
    fi
  else
    command apt "$@"
  fi
}