It used to be that if you wanted to test your sound you could simply cat any file to
/dev/snd, but that doesn't appear to work on any of the systems (Debian/Ubuntu/Mint, Arch) that I've tried.
From what I've read, this can be any kind of file - text, pdf, whatever. And if it's a .wav file then it will actually play music.
So how can you do the same thing on modern systems (e.g. ones using pulse audio & other drivers)