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Just replace 15m with desired time. no suffix or 's' for seconds; 'h' for hours
You need to be root or in audio group to write to /dev/dsp.
You may use yes | head -n 2000 for about 1 second beep.
Wrote this as echo -e '\a' not always works as desired (ex. visual bell)
There are 17 alternatives - vote for the best!
I'd prefer this one, you have to install espeak to get this running
If you can do better, submit your command here.
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