$ mount
It should show " / " in a ramdisk. If you have other /dev/ things that are NOT ramdisk(s), you should be able to umount them without ill effects. If doing so is allowed and doesn't crash you, then you're in RAM. One trick that I've used when running from really slow USB sticks, is to put $HOME/ into a ramdisk. Or at least the .mozilla / .cache parts so the browser can play videos from youtube without buffering for file I/O.
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