setlocal enabledelayedexpansion
set dm=500019
for /l %%i in (300,1,310) do (
set /a dm = !dm!+1
for /f %%j in (a300.txt) do (
set var=%%j
call set "var=%%var:500019=!dm!%%"
echo !var!>>a%%i.txt
)
)
把%dm%改为!dm!
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