Make a RAM disk on Mac OS X 1.5 or later

Create the RAM disk:

diskutil erasevolume HFS+ "ramdisk" `hdiutil attach -nomount ram://1165430`

(the magic number 1165430 is explained here as the number of 512 byte sectors. The string "ramdisk" is just the name of the disk, which will appear under /Volumes after creation)

Write some stuff to the RAM disk:

echo "hello RAM disk" > /Volumes/ramdisk/hello.txt

Eject the RAM disk:

diskutil eject /Volumes/ramdisk

Gathered from here and here so that I remember for later.

On Linux

Found this guide for creating a RAM disk on Linux, but have not tried it yet.

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