@echo off
@title copy sth to current filepath
mode con lines=5 cols=40

SET SourceFile=123.txt
SET GenFile1=456.txt

if exist %SourceFile% (
if not exist %GenFile1% (
copy %SourceFile% %GenFile1%
) else (
echo %GenFile1% is exist!
)
) else (
echo %SourceFile% is not exist!
)

echo Success
ping -n 3 127.0.0.1 > nul