如何比较文本文件的特定行？

Question

例

    (
Line1: echo echo example
Line2: echo echo example
Line3: echo echo example
Line4: echo echo File Example
) > File1.txt

(
Line1: echo echo example
Line2: echo echo example
Line3: echo echo File
Line4: echo echo File
) > File2.txt

想要比较Line4是否相等，但丢弃其他行。 在这种情况下返回false

Answer 1

您可以使用数组来比较这种类型的文件：

@echo off
(
    echo Line1:example
    echo Line2:example
    echo Line3:example
    echo Line4:File
)> File1.txt

(
    echo Line1:example
    echo Line2:example
    echo Line3:File
    echo Line4:example
)> File2.txt

setlocal enabledelayedexpansion
set i=0
for /f "tokens=* delims=" %%a in ('Type "File1.txt"') do (
  set /a i+=1
  set File1_Line[!i!]=%%a
)
set File1_Line[4]
pause
::********************************************************
set i=0
for /f "tokens=* delims=" %%a in ('Type "File2.txt"') do (
  set /a i+=1
  set File2_Line[!i!]=%%a
)
set File2_Line[4]
pause
::********************************************************
echo File1_Line[4]" = !File1_Line[4]!"
pause
echo File2_Line[4] = "!File2_Line[4]!"
pause
::********************************************************
IF /I "!File1_Line[4]!" equ "!File2_Line[4]!" ( echo TRUE 
 ) else (
echo False
)
pause

Answer 2

@ECHO OFF
SETLOCAL
SET "sourcedir=U:\sourcedir"
SET "filename1=%sourcedir%\q36252686.txt"
SET "filename2=%sourcedir%\q36252686_2.txt"

:: This part simply establishes the data IN the files

FOR %%a IN ("%filename1%" "%filename2%") DO DEL %%a 2>nul
FOR %%a IN (
"Line1: echo echo example"
"Line2: echo echo example"
"Line3: echo echo example"
"Line4: echo echo File Example"
) DO >> "%filename1%" ECHO(%%~a

FOR %%a IN (
"Line1: echo echo example"
"Line2: echo echo example"
"Line3: echo echo File"
"Line4: echo echo File"
) DO >> "%filename2%" ECHO(%%~a

:: line to match

SET /a matchonline=4
:: lines to skip
SET  /a skiplines=matchonline-1
SET "skiplines=skip=%skiplines%"

IF %matchonline%==1 SET "skiplines=" 

FOR /f "usebackq%skiplines%delims=" %%a IN ("%filename1%") DO (
 FOR /f "usebackq%skiplines%delims=" %%b IN ("%filename2%") DO (
  IF "%%a"=="%%b" (SET "result=true") ELSE (SET "result=false")
  GOTO done
 )
)
:done
ECHO match ON line %matchonline%=%result%

GOTO :EOF

您需要更改filename1和filename2的设置以适合您的具体情况。 我在您的系统上将您的数据生成为方便的文件名以进行测试。

读取第一个文件，跳过匹配前的行，并将其内容分配给%%a 。 当发生这种情况时，重复第二个文件，到%%b

设置结果并突破循环。