if [ -n "$PS1" ]; then
    #
    #   Number of colors and standard colors.
    #
    c_num=$(tput colors)
    #
    # Load better colors for ls.
    #
    if [ -x "$(which /bin/dircolors)" -a $c_num -ge 256 -a  -f ~/.dir_colors ]; then
        eval $(dircolors ~/.dir_colors)
    fi
fi