使用批處理刪除文本文件中特定單詞之前的文本

Question

這是我正在尋找的一個例子。 假設我們有一個包含以下內容的文本文件：

eggs bacon
delete me here
test me 
delete this too here

我想要一個批處理文件，刪除“這里”一詞之前的所有內容，但只刪除同一行中的所有內容。

所以 output 應該是：

eggs bacon
here
test me
here

我嘗試使用 for 循環逐個解析文本標記，但它讓我無處可去。

Answer 1

@ECHO Off
SETLOCAL ENABLEDELAYEDEXPANSION
rem The following settings for the source directory, destination directory, target directory,
rem batch directory, filenames, output filename and temporary filename [if shown] are names
rem that I use for testing and deliberately include names which include spaces to make sure
rem that the process works using such names. These will need to be changed to suit your situation.

SET "sourcedir=u:\your files"
SET "destdir=u:\your results"
SET "filename1=%sourcedir%\q66181497.txt"
SET "outfile=%destdir%\outfile.txt"

SET "dropbefore=here"

(
FOR /f "usebackqdelims=" %%b IN ("%filename1%") DO (
 rem transfer line read to variable "line" for manipulation
 SET "line=%%b"
 IF "%%b" equ "!line:*%dropbefore%=!" (
  rem target text missing from line
  ECHO %%b
 ) ELSE (
  rem target found on line. replace all-before-target with target
 ECHO !line:*%dropbefore%=%dropbefore%!
 )
)
)>"%outfile%"
GOTO :EOF