#!/bin/bash



    decision=yes

    while [[ $decision = 'yes' ]]; do


    read -p "please, enter the users first name: " fname

    read -p "please, enter the users last name: " lname

    read -p "please, enter the users initial group: " igroup

    read -p "please, enter any additional groups the user belongs to: " agroup


    igroupl=$(tr '[:upper:]' '[:lower:]' <<<"$igroup")

    agroupl=$(tr '[:upper:]' '[:lower:]' <<<"$agroup")

    lnameu=$(tr '[:lower:]' '[:upper:]' <<<"$lname")

    fnameu=$(tr '[:lower:]' '[:upper:]' <<<"$fname")

    usrnm1=$(tr '[:upper:]' '[:lower:]' <<<"$lname")

    usrnm2=$(tr '[:upper:]' '[:lower:]' <<<"${fname:0:1}")

    usrnm=$usrnm1$usrnm2


        if getent passwd "$usrnm" >/dev/null; then

            for ((i=1;;i++)); do

            getent passwd "$usrnm$i" >/dev/null || { usrnm=$usrnm$i; break; };

            done;

        fi


    useradd -c "$fnameu $lnameu" -g "$igroupl" -g "$agroupl" "$usrnm"

    echo password01 | passwd "$usrnm" --stdin


    read -p "would you like to add another user?(yes/no): " yesno

    decision=$(tr '[:upper:]' '[:lower:]' <<<"$yesno")


    doneloop=1
        while ((doneloop == 1)); do

        if [[ $decision = 'yes' ]]; then

        decision=yes

        doneloop=2

        elif [[ $decision = "no" ]]; then

        echo "thank you for using this program"

        doneloop=2

        else

        echo "please use a correct option.(yes/no): "

        read yesno

        decision=$(tr '[:upper:]' '[:lower:]' <<<"$yesno")

        fi

    done

done