A shell function for creating a RAM disk of arbitrary size. Add to your bash (or other shell) profile.

OS X RamDisk

ramdisk () {
	test "$1" || 1=2
	DISK_NAME="RamDisk"
	MAX_SIZE=6
	DISK_SIZE=$((${1}*1024*1024*1024/512))
	DISK_FOUND=`df | grep -o $DISK_NAME`
	if [[ $1 -gt $MAX_SIZE ]]
	then
		echo "NOTICE: Can't create a ram disk larger than $MAX_SIZE GB"
		return
	fi
	if [[ $DISK_FOUND = $DISK_NAME ]]
	then
		echo "NOTICE: A disk named $DISK_NAME already exists!"
		return
	fi
	if ! [[ $1 =~ '^[0-9]+$' ]]
	then
		echo "NOTICE: Supply a number between 1 and $MAX_SIZE"
		return
	fi
	diskutil erasevolume HFS+ $DISK_NAME `hdiutil attach -nomount ram://$DISK_SIZE`
}