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@echo off

ECHO Set working directory
pushd %~dp0

ECHO Deleting existing combined file
del combined.csv

setlocal ENABLEDELAYEDEXPANSION

REM set count to 1
set cnt=1

REM for each file that matches *.csv
for %%i in (*.csv) do (
REM if count is 1 it's the first time running
  if !cnt!==1 (
REM push the entire file complete with header into combined.csv - this will also create combined.csv
    for /f "delims=" %%j in ('type "%%i"') do echo %%j >> combined.csv
REM otherwise, make sure we're not working with the combined file and
  ) else if %%i NEQ combined.csv (
REM push the file without the header into combined.csv
    for /f "skip=1 delims=" %%j in ('type "%%i"') do echo %%j >> combined.csv
  )
REM increment count by 1
  set /a cnt+=1
)