windows 如何使用命令行在文本文件中附加一个空行？
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How to append an empty line in a text file using the command line?
提问by Arunachalam
How do I append an empty line in a text file using the command line?
如何使用命令行在文本文件中附加一个空行？
echo hi >a.txt
echo >>a.txt
echo arun >>a.txt
Here the output comes as:
这里的输出如下：
hi
echo on
arun
So how could I append an empty line? I want it to be like this:
那么我怎么能附加一个空行呢？我希望它是这样的：
hi
arun
When I added this line on code @echo off, it said echo off. How can it be done?
当我在代码上添加这一行时@echo off，它说echo off。怎么做到呢？
回答by Michael Myers
In the Windows command prompt, try:
在 Windows 命令提示符下，尝试：
echo.>> a.txt
Note that there is no space between echoand .; if there is one, it will output a dot. There is also no space between the .and the >>; anything in between would be output to the file, even whitespace characters.
请注意，echo和之间没有空格.；如果有，它会输出一个点。.和之间也没有空格>>；中间的任何内容都将输出到文件中，甚至是空白字符。
See the Microsoft documentation for echo.
If this were in bash, your first try would have been correct:
如果这是在 bash 中，您的第一次尝试将是正确的：
echo >> a.txt
But in Windows, the unqualified echocommand tests whether there is a command prompt or not (echo offturns the prompt off and echo onturns it back on).
但是在 Windows 中，unqualifiedecho命令测试是否有命令提示符（echo off关闭提示符并echo on重新打开）。
回答by jjclarkson
At Windows Prompt:
在 Windows 提示符下：
echo. >> a.txt
At BASH Prompt:
在 BASH 提示符下：
echo >> a.txt
(Echo by default sends a trailing newline)
（默认情况下，echo 发送尾随换行符）
-n do not output the trailing newline
-n 不输出尾随换行符
回答by Vishal Seth
It should be possible with a simple
应该可以通过一个简单的
echo hi\n >> a.txt
