[umanwizard]

Not sure if it still works, but catting /dev/random to a sound device used to be a great way to test that your speakers were working by producing ear-splitting static noise.

[iamtedd]

A more pleasant method could be: http://kmkeen.com/awk-music/

[makeworld]

    cat /dev/urandom | aplay

Still works well on my machine, and I use it all the time to test :)

[umanwizard]

Ah, neat, but I seem to remember catting it to an actual device node, not to an executable.

[adamnew123456]

You're thinking of /dev/dsp, which was an OSS thing before the move to ALSA. It still exists on the BSDs AFAIR but has to be emulated on modern Linux: https://unix.stackexchange.com/questions/103746/why-wont-lin...

[umanwizard]

Yep, that’s the one!

[hpb42]

You can: cat /dev/urandom | aplay