#!/usr/bin/env bash

largest=0

for i in {1..10}; do

    read -p "Enter a number: " num
    if ! [[ $num =~ ^[0-9]+$ ]]; then
        echo "ERROR: Invalid input only positive numerical characters are allowed"
        exit 1
    elif [ $num -gt $largest ]; then
        if [ $num -gt 10000 ]; then
            echo "ERROR: The number entered is too large"
            exit 1
        else
            largest=$num
        fi
    fi
done

echo "The largest number is: $largest"