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批处理脚本将文本中的行修剪为前 30 或 50 个字符

tag-icon • tag-icon command-line batch script
批处理脚本将文本中的行修剪为前 30 或 50 个字符

我现在对脚本还不熟悉，但我发现理解“for”命令真的很难（尤其是那些标记和分隔符等）。话虽如此，我认为 for 命令可以用来做我正在做的事情。如果不是，而且有更简单的方法，请忽略我的无知 :(

假设我在文本文件 abc.txt 中有多行，每行都以“（引号）开头和结尾，例如一个包含 3 行的文件

"hey what is going on @mike220. I am working on your car. Its engine is in very bad condition" 
"Because if you knew, you'd get shredded and do it with certainty"
"@honey220 Do you know someone who has busted their ass on a diet only for results to come to a screeching halt after a few weeks"

我如何将引号内的每一行修剪为固定长度，例如 30 或 50 或 100 个字符（包括空格） 我想批量输入字符数，它可以相应地进行修剪并生成一个带有引号内修剪行的文件 def.txt。

假设我输入 50，上述示例的结果应该是

"hey what is going on @mike220. I am working on you"
"Because if you knew, you'd get shredded and do it"
"@honey220 Do you know someone who has busted their"

谢谢

PS 如果您使用 For 命令，请解释该命令。

编辑： 虽然提供的答案有效，但非英语文本存在问题。我在输入文件中的非英语文本的输出文件中得到了乱码。任何帮助@barlop这里是非英语文本（1行）

"फाइल है इसको ना पढ़े आपको कोई मतलांब नही"

答案1

这样做

@echo off

setlocal enableextensions enabledelayedexpansion

set /p num=Enter chars to show between quotes: 
set /a num=%num%+1

for /f "delims=" %%f in (a.txt) do (
set a=%%f

echo !a:~0,%num%!^"
)

因此，使用您的示例，它在 a.txt 中，因此每一行都以引号开头，并且也有空格，但如果没有空格它也可以工作。

"hey what is going on @mike220. I am working on your car. Its engine is in very bad condition" 
"Because if you knew, you'd get shredded and do it with certainty"
"@honey220 Do you know someone who has busted their ass on a diet only for results to come to a screeching halt after a few weeks"

并运行批处理脚本

C:\blah>a.bat
Enter chars to show between quotes: 3
"hey"
"Bec"
"@ho"

C:\blah>a.bat
Enter chars to show between quotes: 50
"hey what is going on @mike220. I am working on you"
"Because if you knew, you'd get shredded and do it "
"@honey220 Do you know someone who has busted their"

C:\blah>

我现在添加了两行，使其输出到文件 def.txt

@echo off


setlocal enableextensions enabledelayedexpansion

del def.txt 2>nul


set /p num=Enter chars to show between quotes: 
set /a num=%num%+1

for /f "delims=" %%f in (a.txt) do (
set a=%%f

echo !a:~0,%num%!^"
echo !a:~0,%num%!^" >>def.txt
)


C:\crp\dlsnex>a
Enter chars to show between quotes: 2
"he"
"Be"
"@h"

C:\crp\dlsnex>type def.txt
"he"
"Be"
"@h"

C:\crp\dlsnex>

forcmd 中的语句有点棘手。要理解这一点，只需开始尝试编写一个 for 语句，打印文件的每一行，不进行修剪，并使用一个简单的文件，例如包含两行 abcdefg 和 hijklmn 的文件。然后使用这个 for 语句，for /f %f in (a.txt) do @echo %f然后就可以构建它了。但是，如果您要弄清楚如何做到这一点，那就是您的起点。一旦有了它，添加“delims=”看看它有什么效果（您可能需要在文件的行中留出一些空格才能看到效果）。然后看看如何批量获取子字符串。set a=abcdefg echo %a:~0,2%（打印 ab）。

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