Using DOS batch script: find a line in a propertie

问题:

Trying to replace a string in a properties file on a certain line by using a batch file. I know that this can be done WITHOUT the use of a temp file, as I have seen it before, but forgotten how to do it.

I know that if I have a var.properties file that contains this:

CLASSPATH=bsh.jar;other.jar
VARTEST=dummy
ANOTHERVAR=default

I am trying to update the CLASSPATH value in the .properties file without changing the order of the properties file.

This is a properties file and so I believe the answer would be related to using:

for /f "tokens=1,2* delims==" %%i in (var.properties) do (
  @echo Key=%%i Val=%%j
)

回答1:

Instead of findstr use find with the /v and /i switches on "classpath". This will OMIT returning the line with classpath in it, then you can echo what you want in the file along w/VARTEST=dummy

SET NEWVAL=CLASSPATH=test.jar
SET FILE=think.properties
FOR /F "USEBACKQ tokens=*" %%A IN (`TYPE "%FILE%" ^|FIND /V /I "classpath"`) DO (
 ECHO CLASSPATH=%NEWVAL%>>"%FILE%"
 ECHO %%A>>"%FILE%"
)

EDIT:

SETLOCAL ENABLEDELAYEDEXPANSION
SET NEWVAL=test.jar
SET OLDFILE=OLD_think.properties
SET NEWFILE=think.properties
SET COUNT=1

MOVE "%NEWFILE%" "%OLDFILE%"

FOR /F "USEBACKQ tokens=*" %%A IN (`TYPE "%OLDFILE%" ^|FIND /C /I "classpath"`) DO (
 SET LINE=%%A
 )
FOR /F "USEBACKQ tokens=*" %%A IN (`FIND /V "" ^<"%OLDFILE%"`) DO (
 IF %COUNT% NEQ %LINE% (ECHO %%A>>"%NEWFILE%") ELSE (ECHO %NEWVAL%>>"%NEWFILE%")
 SET /a COUNT=!COUNT!+1
)

Basically states,

1. rename think.properties to OLD_think.properties
2. read OLD_think.properties and find the line number with string "classpath" in it and set it to variable LINE
3. Find all lines in OLD_think.properties, and echo them into think.properties. once you reach the line where your "CLASSPATH" string existed, it inserts the new line you wanted to replace it with, and everything else stays the same.

回答2:

I finally broke down and accepted a method using a "temp" file. Using delayed expansion with the '!' character solved my question. Much of this success was due to input by mecaflash .

You can call this script with: CALL Script.bat PropKey NewPropValue Filename

@echo off
:: script for updating property files
SETLOCAL EnableExtensions
SETLOCAL EnableDelayedExpansion
if "%3"=="" (
  ECHO Script will optionally accept 3 args: PropKey PropVal File
  SET PROPKEY=UseCompression
  SET PROPVAL=false
  SET FILE=config.properties
) ELSE (
  SET PROPKEY=%1
  SET PROPVAL=%2
  SET FILE=%3
)
FINDSTR /B %PROPKEY% %FILE% >nul
IF %ERRORLEVEL% EQU 1 GOTO nowork
MOVE /Y "%FILE%" "%FILE%.bak"
FOR /F "USEBACKQ tokens=*" %%A IN (`TYPE "%FILE%.bak" ^|FIND /N /I "%PROPKEY%"`) DO (
  SET LINE=%%A
)
FOR /F "tokens=1,2* delims=]" %%S in ("%LINE%") DO SET LINE=%%S
SET /A LINE=%LINE:~1,6%
SET /A COUNT=1
FOR /F "USEBACKQ tokens=*" %%A IN (`FIND /V "" ^<"%FILE%.bak"`) DO (
  IF "!COUNT!" NEQ "%LINE%" (
      ECHO %%A>>"%FILE%"
  ) ELSE (
      ECHO %PROPKEY%=%PROPVAL%>>"%FILE%"
      ECHO Updated %FILE% with value %PROPKEY%=%PROPVAL%
  )
  SET /A COUNT+=1
)
GOTO end
:nowork
echo Didn't find matching string %PROPKEY% in %FILE%. No work to do.
pause
:end