@echo off
setLocal EnableDelayedExpansion
 
set limit=20000
set file=export.csv
set lineCounter=1
set filenameCounter=1
 
set name=
set extension=
for %%a in (%file%) do (
    set "name=%%~na"
    set "extension=%%~xa"
)
 
for /f "tokens=*" %%a in (%file%) do (
    set splitFile=!name!-part!filenameCounter!!extension!
    if !lineCounter! gtr !limit! (
        set /a filenameCounter=!filenameCounter! + 1
        set lineCounter=1
        echo Created !splitFile!.
    )
    echo %%a>> !splitFile!
 
    set /a lineCounter=!lineCounter! + 1
)

如上面的代码所示，它将原始的csv文件分割成多个csv文件，限制为20 000行。所有你需要做的是更改！文件！和！限制！变量相应。希望它有帮助。