In unix, is there a copy and delete file command, or should I just use "system". I worry about security risks if my program were hacked to abuse the function which deletes a temporary file the game creates.

Have a look at <unistd.h> (unlink()) for a start and here for more.

Copying a file is, as far as I know, typically done by hand (create the target file, copy the data).

For temporary files, you can use tmpfile() from <stdio.h> -- it automatically gets deleted when you close all the FILE* handles.

Quote: Original post by matt_j
the function which deletes a temporary file the game creates.

It sounds like you need to read about the tmpfile function.

EDIT: In my defense, Fruny is a ninja.

CopyFileEx (windows API)
remove (stdio)
tmpfile (stdio)