You can use the code first posted here, in order to count the number of lines in a multiple text or .csv files in a folder.
Simply put this copy in a text file in the folder containing the source files. Change to the extension to .bat and double-click it.
@echo off cls setlocal EnableDelayedExpansion set /a total=0 ( for %%f in (*.txt) do ( for /f %%a in ('type "%%f"^|find /C /v "" ') do set /a total+=%%a&echo %%f %%a ) echo total !total! )>>list.txt
GOTO :EOF
A new file named 'list.txt' will be generated showing the name of each source file and the number of lines in the file.
Confirmed the counts were correct in NotePad ++