LINES=$(wc -l < testfile)
COUNTER=0
export COUNTER
filename="$1"
echo "length is $LINES"
while read -r line; do
    name="$line"
    echo "done smth with line $name"
    export COUNTER=$(($COUNTER+1))
    echo $COUNTER/$LINES
done < "$filename"
echo $COUNTER

#length is        3
#done smth with line first
#1/ 3
#done smth with line second
#2/ 3
#done smth with line third
#3/ 3
#3