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在Linux命令行中，换行可以使用以下方法：
1. 在命令末尾使用反斜杠 "\":
例如：
```
$ echo "This is a very long \
line of text that needs \
to be broken into multiple lines."
```
输出：
```
This is a very long line of text that needs to be broken into multiple lines.
```
2. 使用引号包裹命令并在引号中换行：
例如：
```
$ echo "This is a very long
> line of text that needs
> to be broken into multiple lines."
```
输出：
```
This is a very long
line of text that needs
to be broken into multiple lines.
```
3. 将多行命令写入脚本文件，然后执行脚本文件：
例如，在一个名为`script.sh`的文件中写入以下内容：
```
#!/bin/bash
echo "This is a very long
line of text that needs
to be broken into multiple lines."
```
保存文件后，修改文件权限为可执行：
```
$ chmod +x script.sh
```
然后执行脚本文件：
```
$ ./script.sh
```
输出：
```
This is a very long
line of text that needs
to be broken into multiple lines.
```
