#!/bin/bash
file_name=$1
input="./a.txt"
while IFS= read -r line
do
  for i in $(seq 1 $line)
  	do
  		echo -n '*'
  	done
  	echo ""

done < "$input"
-------------------------------------
#!/bin/bash
input_number=$1
sum=0

for (( i=0; i<${#input_number}-1; i++ )); do
  for (( j=0; j<2; j++ )); do
  	echo "${input_number:$i+j:1}"
	if (( $j % 2 == 0 ))
	then
		sum=$((sum + ${input_number:$i+j:1}))
	else
		sum=$((sum + $((${input_number:$i+j:1}*10))))
	fi
  done
  echo "$sum"
done