set sjet=50
echo %sjet%
set myfile=C:\11111111\123.txt
IF NOT EXIST %myfile% (
echo not exist
echo %sjet% >> %myfile%
) else (
echo exist
@for /f %%i in (%myfile%) do @set /A sjet=%%i+1
)
del %myfile%
echo %sjet% >> %myfile%
echo "==>"%sjet%
@pause press any key