if (( $SHLVL == 1 )); then
    if [ -x /usr/bin/clear_console ]; then
      /usr/bin/clear_console -q
    elif [ -x /usr/bin/clear ]; then
      /usr/bin/clear
    elif [ -x /usr/bin/tput ]; then
      /usr/bin/tput clear
    else
      echo "${BASH_SOURCE##*/}: couldn't clear the screen"
    fi
fi