计数参数 [英] Count arguments

问题描述

我写以下命令:

#!/bin/bash
echo "Enter values a and b (separate with space)"
read a b
echo $#

我想计算用户输入了多少个参数.我尝试使用$#进行计数，但输出为0.

And I want to count how many arguments the user has entered. I try to count with $#, but the output is 0.

出什么问题了?我在做什么错了?

What's the problem? What I am doing wrong?

推荐答案

您可以使用数组读取整行并计算#个单词:

You may use an array to read complete line and count # of words:

read -p "Enter values (separate with space): " -ra arr

Enter values (separate with space): abc foo bar baz 123

然后打印字数:

echo "No of words: ${#arr[@]}"

No of words: 5

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