将文件的第一行设置为变量的最短 Windows 批处理文件代码？
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Shortest Windows batch file code to get first line of a file set to a variable?
提问by djangofan
I am looking for the shortest amount of code possible that will get the first line of a text file and set it to a variable in Windows.
我正在寻找尽可能短的代码，以获取文本文件的第一行并将其设置为 Windows 中的变量。
There are lots of examples of this kind of thing in other threads on this StackExchange site but I am notlooking for how to loop through and display all lines in a file. What I want is to just simplyget the first line.
在这个 StackExchange 站点上的其他线程中有很多这种事情的例子，但我不是在寻找如何循环并显示文件中的所有行。我想要的只是简单地获得第一行。
回答by Joe
set /p var= <Text.txt
echo %var%
Referenced from: http://forums.techguy.org/software-development/551867-batch-file-read-line-text.htmlIronically the poster is able to get the first line but wanted to loop through the whole file!
引用自：http: //forums.techguy.org/software-development/551867-batch-file-read-line-text.html具有讽刺意味的是，海报能够获得第一行，但想要遍历整个文件！
回答by nephi12
this is just a slightly shorter version:
这只是一个略短的版本：
set/pz=<file
echo %z%
回答by user3110750
I couldn't get this to work under Windows 7; the variable was simply not set. But here's a slightly longer solution:
我无法让它在 Windows 7 下工作；变量根本没有设置。但这里有一个稍长的解决方案：
for /F "delims=" %%i in (Text.txt) do (
set Z=%%i
goto BREAK1
)
:BREAK1
echo %Z%
回答by phuclv
If delayed expansionhas been enabled before (Setlocal EnableDelayedExpansionor cmd started with /V:ONoption) then there's a shorter (one-liner) version
如果之前已启用延迟扩展（Setlocal EnableDelayedExpansion或 cmd 以/V:ON选项开头），则有一个较短的（单行）版本
set /pz=<filename.txt&echo !z!
回答by Ganesh Kamath - 'Code Frenzy'
I had to change the line of file for a text file inside Program Files(x86)directory. After trying a lot of solutions, the following solution worked for me:
我不得不更改Program Files(x86)目录内文本文件的文件行。在尝试了很多解决方案后，以下解决方案对我有用：
Steps:
脚步：
- Use
typecommand piped withfindstrto get a file with the desired data - Delete the original file
- Use
typecommand to move the content back to the file with the original file name - Delete the new file
- 使用
type管道命令findstr获取包含所需数据的文件 - 删除原始文件
- 使用
type命令将内容移回原文件名的文件 - 删除新文件
Example:
例子：
@echo off
set originalFile="C:\Program Files (x86)\<Target File Path>\<Target File Name>"
set newFile="C:\Program Files (x86)\<Target File Path>\<Target newFile Name>"
if exist %originalFile% (
type %originalFile% | findstr /v T4VSHost >> %newFile%
del %originalFile% /F /Q
type %newFile% >> %originalFile%
del %newFile% /F /Q
)
@echo on
Note:
笔记：
When I tried writing the change back to the original file in step 1, the result was a an empty file.
当我在步骤 1 中尝试将更改写回原始文件时，结果是一个空文件。
Note the string I am matching is T4VSHost, which occurs in the file at path C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude
请注意我匹配的字符串是T4VSHost，它出现在路径的文件中C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude
回答by S Techy Tse
just FYI...
仅供参考...
I tried it and didn't work. But I realized finally that I had to reproduce the text file (originally the text file is generated by a powershell script) so when I did this and it works.
我试过了，没有用。但我终于意识到我必须重现文本文件（最初文本文件是由 powershell 脚本生成的），所以当我这样做时，它就可以工作了。
:: output to different file
Type Text.txt > text2.txt
Then apply the same code (change text.txtto text2.txt)
然后应用相同的代码（更改text.txt为text2.txt）
set /p var= <Text2.txt
echo %var%
If I use the original one, I would either get garbage in %var%, not sure if the text file has not <CR>or what. Anyway, by reproducing the text file, it seems working fine.
如果我使用原始文件，我要么会得到垃圾%var%，不确定文本文件是否没有<CR>或什么。无论如何，通过重现文本文件，它似乎工作正常。
