题解 | #打印每一行出现的数字个数#

a=0
while read line;do
    ((a++))
    b=$(echo $line|grep -o [1-5])
    n=0
    for i in $b;do
       let n+=1
    done
    echo line$a number: $n
    let sum+=$n
done< nowcoder.txt 
echo sum is $sum