I am using a command like so to create a ram disk:
diskutil erasevolume HFS+ "ram disk" `hdiutil attach -nomount ram://307200`
This works succesfully, and I get a /Volumes/ram disk mounted on my system that I can use that is mounted from /dev/disk5 or some such place.
I would like to be able to control where this goes, to be able to mount to /tmp/my_dir or where-ever. I have tried many combinations of changing parameters in hdiutil and diskutil without success. What is the right way to do this?