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copied!<pre><code>@ECHO OFF SETLOCAL :temploop (SET tempfile="%temp%\temp%random%.#$#") IF EXIST %tempfile% GOTO temploop (FOR /f "delims=" %%x IN (myfile.ini) DO ( >%tempfile% ECHO %%x FINDSTR /b "Extmgr_Addins=" <%tempfile% >NUL IF ERRORLEVEL 1 (ECHO.%%x) ELSE ( FIND "mc" <%tempfile% >NUL IF ERRORLEVEL 1 (ECHO %%x,mc) ELSE (ECHO %%x) ) ) )>newfile.ini DEL %tempfile% ECHO ==== original file ===== type myfile.ini ECHO ==== modified file ===== type newfile.ini ECHO ==== differences ===== FC myfile.ini newfile.ini ECHO ==== end of report ===== GOTO :eof </code></pre> <p>Result:</p> <pre><code>tempfile="c:\temp\temp8291.#$#" ==== original file ===== notthisline Extmgr_Addins=notargetstring Extmgr_Addins=mchastargetstring Extmgr_Addins=hastargetatendmc Extmgr_Addins=notbeginsnotargetstring Extmgr_Addins=notbeginsmchastargetstring Extmgr_Addins=notbeginshastargetatendmc mcinthisline thislinehasmctoo andat the end mc mc and Extmgr_Addins= Extmgr_Addins=finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" Extmgr_Addins=mc finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" ==== modified file ===== notthisline Extmgr_Addins=notargetstring,mc Extmgr_Addins=mchastargetstring Extmgr_Addins=hastargetatendmc Extmgr_Addins=notbeginsnotargetstring Extmgr_Addins=notbeginsmchastargetstring Extmgr_Addins=notbeginshastargetatendmc mcinthisline thislinehasmctoo andat the end mc mc and Extmgr_Addins= Extmgr_Addins=finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}",mc Extmgr_Addins=mc finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" ==== differences ===== Comparing files myfile.ini and NEWFILE.INI ***** myfile.ini notthisline Extmgr_Addins=notargetstring Extmgr_Addins=mchastargetstring ***** NEWFILE.INI notthisline Extmgr_Addins=notargetstring,mc Extmgr_Addins=mchastargetstring ***** ***** myfile.ini mc and Extmgr_Addins= Extmgr_Addins=finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" Extmgr_Addins=mc finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" ***** NEWFILE.INI mc and Extmgr_Addins= Extmgr_Addins=finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}",mc Extmgr_Addins=mc finally !@#$%^&*()_+|\=-0<>,./?:;'[]{}" ***** ==== end of report ===== </code></pre> <p>The first few lines deal with establishing a valid temporary filename.</p> <p>We then </p> <ol> <li>Read a line</li> <li>dump it into the tempfile</li> <li>Check for the line beginning with the target string</li> <li>If not-found (errorlevel 1) ECHO the line</li> <li>If found (Not errorlevel 1, so errorlevel is 0)</li> </ol> <ul><li>Check for presence of "mc"</li> <li>if not found, output line with ",mc" appended else just output the line</li> </ul> <p>Then delete the tempfile and show a report: The original MYFILE.INI used The output NEWFILE.INI and the differences between them.</p> <p>Writing the line-under-examination to the tempfile means that awkward characters like <code><</code> and <code>></code> which are redirectors in batch are dealt with properly. The normal method would be to <code>ECHO %%x|findstr...</code> but <code>></code> gets stuck in the pipe and leaks out an error message.</p> <p>About the only problem is that empty lines and possibly lines beginning ';' will be deleted from the output, but lines consisting soleley of spaces will be preserved...</p>

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