Batch file to comment specific lines into a text file

Posted on 2012-12-26
Last Modified: 2012-12-28
Hi Experts,

Happy cristmas for all, and hope we find all the happiness, health and money (lotof money $$$)  :D

Please, i need to do a batch file like that :

MyBatchFile.bat    file.txt    FileWithLineToComment.txt

Where :

     it's a text file, this one containall the lines text (not numbers of line) that we need to comment.

   Containe all the lines

   Is the program that i need to write. This batch file will :
  1- open FileWithLineToComment.txt, and read line by line
  2- for each line we read, we will search it into the "MyFile.txt"
  3- one time we find it we will add " // " in the first of the find line, and like that it will be

Exemple :

MyFile.txt Containe :

Open in new window


Open in new window

if i do this command line :
MyBatchFile.bat    file.txt    FileWithLineToComment.txt

Open in new window

MyFile.txt   will be like that:

Open in new window

Hope you can help me

Question by:Joesephlebon
  • 2
LVL 43

Expert Comment

by:Steve Knight
ID: 38723048
Are these real world examples, or are they going to be text files with any amount of data, words, spaces, commas, other characters potentially on the line.  Same for the list of lines to check?

Are there any blank lines etc. in the file that are important?

And just to check it seems you are checking the whole line to comment, i.e. if your string was found part way across the line.

If all of those end up being just like your answer it is a relatively simple for loop but no point writing that if not.


LVL 52

Accepted Solution

Bill Prew earned 500 total points
ID: 38727187
This should give you a pretty good place to start, let me know what questions you have.

@echo off
setlocal EnableDelayedExpansion

REM Make sure required parms were supplied
if "%~1" EQU "" (
  echo No data file specified to process
  exit /b
if "%~2" EQU "" (
  echo No comment file specified to process
  exit /b

REM Get input file and comment file from command line parms
set Filename=%~1
set Comments=%~2

REM Define name for temporary file
set Outfile=%Temp%\%~nx1

REM Send changed file to tem file for now
  REM Read each line of file
  for /F "usebackq tokens=*" %%L in ("%Filename%") do (
    REM Read each line from comment file
    set MakeComment=N
    for /F "usebackq tokens=*" %%C in ("%Comments%") do (
      REM If this line is to be commented flag it

      if /I "%%L" EQU "%%C" set MakeComment=Y
    if "!MakeComment!" EQU "Y" (
    ) else (

if exist "%Outfile%" (
  copy /Y "%Outfile%" "%Filename%" >NUL
  del "%Outfile%" >NUL

Open in new window


Author Closing Comment

ID: 38728037
Thanks so much Experts ;)
It's work fine :)
LVL 52

Expert Comment

by:Bill Prew
ID: 38728305
Welcome, glad that was useful.


Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

One of my most closely kept secrets is revealed in this discussion How to output text on the same line This question was recently posted in EE by Simon336697 (…
TOMORROW TOMORROW.BAT is inspired by a question I get asked over and over again; that is, "How can I use batch file commands to obtain tomorrow's date?" The crux of this batch file revolves around the XCOPY command - a technique I discovered w…
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now