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#!/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"