@echo off
set th=999
for /f "tokens=*" %%i in ('dir/b *.csv') do (
echo aa bb cc dd ee cc>temp.txt
for /f "tokens=1-5 delims= " %%i in ('type "%%i"') do (
echo %%i %th% %%k %%l %%m>>temp.txt)
ren /y temp.txt "%%i")
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