Bash - 计算输入数字的平均值

需要有关 Linux Bash 脚本的帮助。本质上，运行脚本时会要求用户提供三组数字，然后计算输入的数字并得出平均值。

#!/bin/bash
echo "Enter a number: "
read a
   while [ "$a" = $ ]; do

echo "Enter a second set of numbers: "
read b
b=$
   if [ b=$ ]

我在这件事上做错了吗？

仍然不确定你想要成为什么样的人。但我认为你可以循环3次。然后每次迭代都会得到一组数字，将它们相加并记录有多少个数字。所以像下面这样。 （注意$numbers和$sum自动初始化为0）

#!/bin/bash    
sum=0
numbers=0
for a in {1..3}; do
  read -p $'Enter a set of numbers:\n' b
  for j in $b; do
    [[ $j =~ ^[0-9]+$ ]] || { echo "$j is not a number" >&2 && exit 1; } 
    ((numbers+=1)) && ((sum+=j))
  done
done

((numbers==0)) && avg=0 || avg=$(echo "$sum / $numbers" | bc -l)
echo "Sum of inputs = $sum"
echo "Number of inputs = $numbers"
printf "Average input = %.2f\n" $avg                               

示例输出将是

Enter a set of numbers: 
1 2 3
Enter a set of numbers: 
1 2 3
Enter a set of numbers: 
7
Sum of inputs = 19
Number of inputs = 7
Average input = 2.71