如何在Windows的命令行中创建一个空文件？ [英] How to create an empty file at the command line in Windows?

问题描述

如何在DOS / Windows命令行中创建空文件？

我试过：

  copy nul> file.txt 
  

但它总是显示文件已复制。

标准cmd中还有其他方法吗？

它应该是一个不需要 touch 命令从Cygwin或任何其他非标准命令。
命令需要从脚本运行，所以不能使用击键。

解决方案

>重定向， Luc Vu 或 Erik Konstantopoulos 点 出到：

  copy NUL EMptyFile.txt 
 copy / b NUL EmptyFile .txt 
  

---

如何从批处理文件创建空文本文件？（2008）也指向：

  type NUL> EmptyFile.txt 
＃also 
 echo。 2> EmptyFile.txt 
 copy nul file.txt> nul＃也在qid的回答低于
 REM。 > empty.file 
 fsutil文件createnew file.cmd 0＃在映射驱动器上创建文件
  

< hr>

Nomad 提及原始邮件：

  C：\Users\VonC\\ \\ prog \tests> aaaa> empty_file 
'aaaa'不被识别为内部或外部命令，可操作的程序或批处理文件。 
 
 C：\Users\VonC\prog\tests> dir 
 
文件夹C：\Users\VonC\prog\tests 
 
 27/11/2013 10:40< REP> 。 
 27/11/2013 10:40< REP& .. 
 27/11/2013 10:40 0 empty_file 
  

---

（原答案，2009年11月）

  echo。> filename 
  

（ echo会将放在文件中！ c $ c> echo 没有'。'会在文件中输入命令ECHO激活）

注意：生成的文件不是空的，但包含一个返回行序列：2个字节。

---

此讨论指向真实的空文件的真实批处理解决方案：

 < nul（set / pz =）> filename 
 
 dir filename 
 11/09/2009 19:45 0 filename 
 1个文件0 bytes 
  

< nul 管道a nul 响应 set / p 命令，这将导致
变量使用保持不变。和 set / p 一样，等号右边的
字符串显示为没有CRLF的提示符。

由于这里的等号右边的字符串为空...结果是一个空文件。 p>

---

与 cd的区别。 > filename （在 Patrick Cuff的回答，并且也产生一个0字节长度的文件）是这个重定向位（ trick）可用于没有任何CR 的回显线：

 < nul set / pz = hello）> out.txt 
< nul（set / pz = world！）>> out.txt 
 dir out.txt 
  





dir命令应该指示文件大小为12个字节： hello world！ / code>。







How to create an empty file at the DOS/Windows command-line?

I tried:

copy nul > file.txt

but it always displays that a file was copied.

Is there any other method in the standard cmd?

It should be a method that does not require the touch command from Cygwin or any other nonstandard commands. The command needs to run from a script so keystrokes cannot be used.

解决方案

Without redirection, Luc Vu or Erik Konstantopoulos point out to:

copy NUL EMptyFile.txt
copy /b NUL EmptyFile.txt

---

"How to create empty text file from a batch file?" (2008) also points to:

type NUL > EmptyFile.txt
# also
echo. 2>EmptyFile.txt
copy nul file.txt > nul # also in qid's answer below
REM. > empty.file
fsutil file createnew file.cmd 0 # to create a file on a mapped drive

---

Nomad mentions an original one:

C:\Users\VonC\prog\tests>aaaa > empty_file
'aaaa' is not recognized as an internal or external command, operable program or batch file.

C:\Users\VonC\prog\tests>dir

 Folder C:\Users\VonC\prog\tests

27/11/2013  10:40    <REP>          .
27/11/2013  10:40    <REP>          ..
27/11/2013  10:40                 0 empty_file

---

(Original answer, November 2009)

echo.>filename

(echo "" would actually put "" in the file! And echo without the '.' would put "Command ECHO activated" in the file...)

Note: the resulting file is not empty but includes a return line sequence: 2 bytes.

---

This discussion points to a true batch solution for a real empty file:

 <nul (set/p z=) >filename

 dir filename
 11/09/2009  19:45                 0 filename
 1 file(s)                         0 bytes

The "<nul" pipes a nul response to the set/p command, which will cause the variable used to remain unchanged. As usual with set/p, the string to the right of the equal sign is displayed as a prompt with no CRLF.

Since here the "string to the right of the equal sign" is empty... the result is an empty file.

---

The difference with cd. > filename (which is mentioned in Patrick Cuff's answer and does also produce a 0-byte-length file) is that this "bit of redirection" (the <nul... trick) can be used to echo lines without any CR:

<nul (set/p z=hello) >out.txt
<nul (set/p z= world!) >>out.txt
dir out.txt

The dir command should indicate the file size as 12 bytes: "hello world!".

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