cpu_usage.sh

ps xro %cpu=,comm= | while read cpu comm; ((i++<5)); do 

    int=$cpu
    int="${int%%.*}"
    if   (($int >= 50)); then color=$'\e[31m';
    elif (($int >= 25)); then color=$'\e[33m';
    else                      color=$'\e[32m';
    fi;

    echo "$color$cpu% $(basename "$comm")"$'\e[0m'"";
done

to prevent error when "-zsh" command is displayed:

echo "$color$cpu% $(basename "$(echo $comm | sed -e 's/-//')")"$'\e[0m'"";