如何从bash中读取整行

我有一个文件file.txt,内容如

i love this world

I hate stupid managers
I love linux

I have MS

当我执行以下操作时：

for line in `cat file.txt`; do
echo $line
done

它给出了类似的输出

I
love
this
world
I
..
..

但我需要输出如下所示的整行 – 任何想法？

i love this world

I hate stupid managers
I love linux

I have MS

while read -r line; do echo "$line"; done < file.txt