Bell (control characters)

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The bell character (from the English bell , for "bell"; abbreviated: BEL ) is a control character and has the numerical value 7 (hexadecimal 0x07) in ASCII and the numerical value 47 (hexadecimal 0x2F) in EBCDIC . When it is sent to a printer or terminal , nothing is output, but an audible signal is generated. Terminal emulator windows usually flash briefly to show the user where the alarm signal came from.

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A Bell symbol also exists in the Baudot code , where it was used for teleprinters no later than 1901 (Code 01011 in the Baudot-Murray Code, CCITT-2) . Sending a bell signal should get the attention of the person in charge of the teletype on the other end of the line.

In C -like programming languages, the bell character is often expressed using the escape sequence \a (for alert (alarm) or audible (audible)). There are in control pictures ( Control Pictures ) an indication of the visual representation of the Bell-character symbol for bell , U + 2407 (␇) that but not with the actual Bell character in the Unicode block Basic Latin ( Basic Latin ), U + 0007, is identical.

In the command lines of Microsoft Windows , PC-DOS and MS-DOS , as well as in any Unix-like shell , the user can enter the command echofollowed by Strg+ G, which is saved as

echo ^G

is shown. After confirming the command by pressing Enter, the computer will beep. The AmigaDOS equivalent is

Beep

See also : Beep (sound)