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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