beep

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beep − ring the bell beep ?percent?
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The beep command rings the keyboard bell.  Percent is relative to
the base volume of the keyboard bell and can range from ‐100 to
100 inclusive.  If percent is nonnegative then the bell volume
is:

base ‐ [(base * percent) / 100] + percent

If percent is negative then the bell volume is:

base + [(base * percent) / 100]

The default percent is 50.

beep

bell, beep