当回显某些内容以重定向到文件时，多个回显命令将不起作用。我认为“>>”重定向器是一个不错的选择:

echo hello > temp
echo world >> temp

如果需要在可以传递给变量的字符串中使用著名的\n，可以编写如下Hello.bat脚本所示的代码:

@echo off
set input=%1
if defined input (
    set answer=Hi!\nWhy did you call me a %input%?
) else (
    set answer=Hi!\nHow are you?\nWe are friends, you know?\nYou can call me by name.
)

setlocal enableDelayedExpansion
set newline=^


rem Two empty lines above are essential
echo %answer:\n=!newline!%

通过这种方式，多行输出可以在一个地方准备，甚至在其他脚本或外部文件中，并在另一个地方打印。

The line break is held in newline variable. Its value must be substituted after the echo line is expanded so I use setlocal enableDelayedExpansion to enable exclamation signs which expand variables on execution. And the execution substitutes \n with newline contents (look for syntax at help set). We could of course use !newline! while setting the answer but \n is more convenient. It may be passed from outside (try Hello R2\nD2), where nobody knows the name of variable holding the line break (Yes, Hello C3!newline!P0 works the same way).

上面的例子可以细化为子程序或独立批处理，如调用:mlecho Hi\ i 'm your computer:

:mlecho
setlocal enableDelayedExpansion
set text=%*
set nl=^


echo %text:\n=!nl!%
goto:eof

请注意，额外的反斜杠不会阻止脚本解析\n子字符串。

如果你需要把结果放到一个文件中，你可以使用:

(echo a & echo: & echo b) > file_containing_multiple_lines.txt

为什么不使用子字符串/替换空格来echo;?

set "_line=hello world"
echo\%_line: =&echo;%

结果:

hello
world

或者，将\n替换为echo;

set "_line=hello\nworld"
echo\%_line:\n=&echo;%

Ken和Jeb的解决方案效果很好。

但是新行只生成一个LF字符，我需要CRLF字符(Windows版本)。

为此，在脚本的末尾，我已经将LF转换为CRLF。

例子:

TYPE file.txt | FIND "" /V > file_win.txt
del file.txt
rename file_win.txt file.txt

简单的

set nl=.
echo hello
echo%nl%
REM without space ^^^
echo World

结果:

hello
world