测试文件:

测试的相关代码:

#!/bin/bash

while read line
do
echo $line
done < test.txt

#!/bin/bash
cat test.txt | while read line
do
echo $line
done

在文件夹中加入test.txt和homework.sh
切换到此文件夹

执行方式1：
chmod +x ./homework.sh
./homework.sh

执行方式2:
bash homework.sh

测试结果