@echo off
if"%2"=="."gotoneifexist _.tmp erase _.tmp
rem Both of the following lines are necessary:rem the first one works on MS DOS and Windows 95/98 but not Windows NT,rem the second works on Windows NT but not the other MS OSs.rem > _.tmpcopy nul: _.tmp > nul:
copy /B %1+_.tmp %2erase _.tmp
gotox:necopy /B %1%2:x