在未更改格式的批处理文件的文本文件中添加新行

Question

这是我的脚本。

@ECHO OFF
SET origfile="C:\Documents and Settings\user\Desktop\test1\before.txt"
SET tempfile="C:\Documents and Settings\user\Desktop\test1\after.txt"
SET insertbefore=4
FOR /F %%C IN ('FIND /C /V "" ^<%origfile%') DO SET totallines=%%C

<%origfile% (FOR /L %%i IN (1,1,%totallines%) DO (
  SETLOCAL EnableDelayedExpansion
  SET /P L=
  IF %%i==%insertbefore% ECHO(
  ECHO(!L!
  ENDLOCAL
)
) >%tempfile%
COPY /Y %tempfile% %origfile% >NUL
DEL %tempfile%
pause

这个脚本我另存为run1.bat。运行后，我对格式有问题。格式无序:尾随的制表符被删除。如何修复它？

原始文件：

header 1<--here got tab delimited format--><--here got tab delimited format-->
header 2<--here got tab delimited format--><--here got tab delimited format-->
header 3<--here got tab delimited format--><--here got tab delimited format-->
details 1
details 2

输出：

header 1<--tab delimited is missing--><--tab delimited is missing-->
header 2<--tab delimited is missing--><--tab delimited is missing-->
header 3<--tab delimited is missing--><--tab delimited is missing-->

details 1
details 2
details 3

Answer 1

用set /p阅读真的很强大，因为它不会改变任何字符。

但它会删除(额外的)尾随的CR/LF/TAB字符。

在这里How Set/p works和这里New technic: set /p can read multiple lines from a file解释了set/p的工作原理

为了解决您的问题并保留尾随选项卡，您需要delayed toggling technic。

因此，您的代码将如下所示

@echo off
SET origfile="C:\Documents and Settings\user\Desktop\test1\before.txt"
SET tempfile="C:\Documents and Settings\user\Desktop\test1\after.txt"
SET insertbefore=4
set LineCnt=0
SETLOCAL DisableDelayedExpansion
(
  FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ %origfile%"`) do (
    set "var=%%a"
    set /a lineCnt+=1
    SETLOCAL EnableDelayedExpansion
    set "var=!var:*:=!"
    IF !lineCnt!==%insertbefore% ECHO(
    echo(!var!
    ENDLOCAL
  )
) >%tempfile%
COPY /Y %tempfile% %origfile% >NUL
DEL %tempfile%