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remove duplicate line breaks from a txt file using batch file

Posted on 2014-09-30
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Last Modified: 2014-10-02
Hi

My PHP error log files are renamed on a daily basis but they are also full of duplicate carriage returns which I'm currently removing using regex in textpad replacing \n\n with \n

This is my batch file that renames them each day at midnight, how can I incorporate something in it to remove the extra line breaks before saving please?

for /f "tokens=1-5 delims=/ " %%d in ("%date%") do rename "php-errors.log" %%d-%%e-%%f.txt

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Question by:Neil Thompson
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Expert Comment

by:Haris Djulic
ID: 40351657
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Assisted Solution

by:Haris Djulic
Haris Djulic earned 200 total points
ID: 40351671
Based on the solution on the link http://www.experts-exchange.com/Programming/Languages/Scripting/Shell/Batch/Q_23027665.html

here is the code which does requested.

@echo off
set source=C:\30092014
set dest=C:\30092014
for /f "tokens=*" %%a in ('dir /b /a-d "%source%\php-errors.log"') do call :process %%a
for /f "tokens=1-5 delims=/ " %%d in ("%date%") do rename "tmp_php-errors.log" %%d-%%e-%%f.txt

goto :eof
 
:process
set filename=%*
echo Working on %filename%
type "%source%\%filename%" > "%source%\tmp_%filename%"
findstr /B /I /R "[!-z]" "%source%\tmp_%filename%" > "%dest%\%filename%"

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Accepted Solution

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Qlemo earned 300 total points
ID: 40351912
Using findstr is a neat trick found by Steve (dragon-it), but we can simplify the above code as we are certain there is only one file - no loop needed here.
@echo off
type php-errors.log | findstr /B /I /R "[!-z]" > %date:~0,2%-%date:~3,2%-%date:~6,4%.txt

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or, if you prefer the original date string construction
@echo off
for /f "tokens=1-5 delims=/ " %%d in ("%date%") do set newname=%%d-%%e-%%f.txt
type php-errors.log | findstr /B /I /R "[!-z]" > %newname%.txt

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Author Closing Comment

by:Neil Thompson
ID: 40356808
Many thanks All,
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