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I have speakers with a built-in amplifier that turn themselves off if no audio has been played for a while.
Behold: ~/bin/turn-on-speaker
#!/usr/bin/env sh
alsabat
Speaker turns on when it recieves sound, but it takes a while to play anything, so I won't hear anything anyway.
rant
auto-off
sh script
beeeeeeeeeep
small script
speakers