#!/bin/sh lock=/tmp/.beep-lock test -f $lock && exit 1 || touch $lock head -c 8 /dev/urandom | \ hexdump -v -e '/1 "%u\n"' | \ awk '{ split("0,3,5,6,7,10,12",a,","); \ for (i = 0; i < 1; i+= 0.00011) \ printf("%08X\n", 60*sin(450*exp((a[$1 % 8]/12)*log(2))*i)) }' | \ xxd -r -p | \ aplay -c 1 -f S32_LE -r 48000 -D plug:default rm -f $lock