number=$1
if ! [[ $number =~ ^[0-9]+$ ]] || [ $number -lt 1 ] || [ $number -gt 99 ];
then if [ $# -ne 1 ]; then
echo "Error: Please input only one positive integer which is less than 100!"
exit 1
fi
if [ $1 -le 0 ] || [ $1 -ge 100 ]; then
echo "Error: The positive integer should be less than 100!"
exit 1
fi
echo "The multiples of 7 which are between 1 and $1 are:"
for i in $(seq 1 $1)
do
if [ expr $i % 7
-eq 0 ]; then
echo "$i"
fi
done
echo "Error: Please provide a positive integer less than 100 as the argument."
exit 1
fi