I started something like this but it definitely is not correct !!!
@echo off
setlocal enableextensions disabledelayedexpansion
set "first=1"
<nul (
for /f "usebackq delims=" %%a in ("Carfinance2.txt") do (
if defined first (set /p ".=%%a" & set "first=") else (set /p ".=,%%a")
)
) >"output.txt"
type filein.txt > fileout.txt
or
more filein.txt > fileout.txt
~bp