a simple alarm

while true; do while [ `date +%H%M` == "1857" ] ; do sleep 1s; yes | head -n 2000 > /dev/dsp; done; done;
this command will beep like an alarm for one minute from 18:57. you can change "1857" to your desired time. you should have alsa-oss package installed, and you should also be root or part of "audio" group.

By: mrwill
2011-04-23 14:44:26

What Others Think

You're probably better off with: at 18:57 at > beep + You need the beep-package of course, and you may need to comment out "pcspkr" from /etc/modules.conf/blacklist.conf .
joedhon · 544 weeks and 1 day ago
And you finish giving commands to "at" by pressing ctrl+D.
joedhon · 544 weeks and 1 day ago
that is of course one way of doing that, but you should be root (or change the permissions of the command) and you should unmute the beep channel in alsamixer (which I have it always muted). a one liner for your command would be: echo beep < at 18:57 and you may also customize the command with some options like: beep -f 5000 -l 100 -r 4 which will change the frequency and length, and will repeat the beep 4 times.
mrwill · 544 weeks and 1 day ago
sorry, I meant: echo beep | at 18:57
mrwill · 544 weeks and 1 day ago
I didn't think of putting an echo in front of beep. This definitly works better than beep|at 18:57 (the latter beeping when I give the command AND at the given time...), I don't understand why, though.
joedhon · 544 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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