Terminal control/Ringing the terminal bell: Difference between revisions

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Task

Make the terminal running the program ring its "bell".

On modern terminal emulators, this may be done by playing some other sound which might or might not be configurable, or by flashing the title bar or inverting the colors of the screen, but was classically a physical bell within the terminal. It is usually used to indicate a problem where a wrong character has been typed.

In most terminals, if the Bell character (ASCII code 7, \a in C) is printed by the program, it will cause the terminal to ring its bell. This is a function of the terminal, and is independent of the programming language of the program, other than the ability to print a particular character to standard out.

6800 Assembly

<lang m68k> .cr 6800

       .tf  bel6800.obj,AP1
       .lf  bel6800

=====================================================;
Ring the Bell for the Motorola 6800 ;
by barrym 2013-03-31 ;
-----------------------------------------------------;
Rings the bell of an ascii terminal (console) ;
connected to a 1970s vintage SWTPC 6800 system, ;
which is the target device for this assembly. ;
Many thanks to: ;
swtpc.com for hosting Michael Holley's documents! ;
sbprojects.com for a very nice assembler! ;
swtpcemu.com for a very capable emulator! ;
reg a holds the ascii char to be output ;
-----------------------------------------------------;

outeee = $e1d1 ;ROM: console putchar routine

       .or  $0f00

-----------------------------------------------------;

main ldaa #7 ;Load the ascii BEL char

       jsr  outeee     ;  and print it
       swi             ;Return to the monitor
       .en</lang>

Ada

<lang ada>with Ada.Text_IO; use Ada.Text_IO; with Ada.Characters.Latin_1;

procedure Bell is begin

  Put(Ada.Characters.Latin_1.BEL);

end Bell;</lang>

Asymptote

<lang Asymptote>beep()</lang> See beep() in the Asymptote manual.

AutoHotkey

<lang AutoHotkey> fileappend, `a, * </lang>

This requires that you compile the exe in console mode (see Lexikos script to change this) or pipe the file through more: autohotkey bell.ahk |more

AWK

<lang awk>BEGIN { print "\a" # Ring the bell }</lang>

BASIC

Applesoft BASIC

<lang Applesoft BASIC> 10 PRINT CHR$ (7);</lang>

Integer BASIC

You can't see it, but the bell character (Control G) is embedded in what looks like an empty string on line 10. <lang Integer BASIC> 10 PRINT "";: REM ^G IN QUOTES

 20 END</lang>

Locomotive Basic

<lang locobasic>10 PRINT CHR$(7)</lang>

ZX Spectrum Basic

The ZX Spectrum had a speaker, rather than a bell. Here we use middle C as a bell tone, but we could produce a different note by changing the final zero to a different value.

Batch File

Source: Here <lang dos>@echo off for /f %%. in ('forfiles /m "%~nx0" /c "cmd /c echo 0x07"') do set bell=%%. echo %bell%</lang>

BBC BASIC

Assuming that the platform the program is running on rings the bell when CHR$7 is sent to the VDU driver:

beeswax

Befunge

Bracmat

Run Bracmat in interactive mode (start Bracmat without command line arguments) and enter the following after the Bracmat prompt {?}: <lang bracmat>\a</lang> Alternatively, run Bracmat non-interactively. In DOS, you write

bracmat "put$\a"

In Linux, you do

bracmat 'put$\a'

Brainf***

Assuming the output stream is connected to a TTY, printing BEL should ring its bell.

<lang brainfuck> I

 +
+ +
+++

+-+-+

 .</lang>

C

<lang c>#include <stdio.h> int main() {

 printf("\a");
 return 0;

}</lang>

C#

Inside a function: <lang csharp>// the simple version: System.Console.Write("\a"); // will beep System.Threading.Thread.Sleep(1000); // will wait for 1 second System.Console.Beep(); // will beep a second time System.Threading.Thread.Sleep(1000);

// System.Console.Beep() also accepts (int)hertz and (int)duration in milliseconds: System.Console.Beep(440, 2000); // default "concert pitch" for 2 seconds </lang>

Clojure

<lang clojure>(println (char 7))</lang>

COBOL

Standard compliant: <lang cobol>DISPLAY SPACE WITH BELL</lang>

Works with: Visual COBOL

<lang cobol> IDENTIFICATION DIVISION.

      PROGRAM-ID. mf-bell.
      
      DATA DIVISION.
      WORKING-STORAGE SECTION.
      01  bell-code              PIC X USAGE COMP-X VALUE 22.
      01  dummy-param            PIC X.
      
      PROCEDURE DIVISION.
          CALL X"AF" USING bell-code, dummy-param
      
          GOBACK
          .</lang>

Common Lisp

<lang lisp> (format t "~C" (code-char 7)) </lang>

D

<lang d>void main() {

   import std.stdio;
   writeln('\a');

}</lang>

Delphi

<lang Delphi>program TerminalBell;

{$APPTYPE CONSOLE}

begin

 Writeln(#7);

end.</lang>

E

<lang e>print("\u0007")</lang>

Emacs Lisp

<lang lisp>(ding) ;; ring the bell (beep) ;; the same thing</lang> On a tty or in -batch mode this emits a BEL character. In a GUI it does whatever suits the window system. Variables visible-bell and ring-bell-function can control the behaviour.

beep was originally called feep, but that changed, recently :-)

Fri Dec 13 00:52:16 1985  Richard M. Stallman  (rms at prep)
	* subr.el: Rename feep to beep, a more traditional name.

F#

<lang fsharp>open System

Console.Beep()</lang>

Forth

Works with: GNU Forth

Works with: iForth

gnuplot

<lang gnuplot>print "\007"</lang>

Go

<lang go>package main

import "fmt"

func main() {

 fmt.Print("\a")

}</lang>

Groovy

<lang groovy>println '\7'</lang>

Haskell

<lang haskell>main = putStr "\a"</lang>

Icon and Unicon

Works on both Icon and Unicon.

<lang Icon> procedure main ()

 write ("\7") # ASCII 7 rings the bell under Bash

end </lang>

J

This j sentence reads "Seven from alphabet." <lang J> 7{a. NB. noun a. is a complete ASCII ordered character vector.</lang>

Java

<lang java>public class Bell{

   public static void main(String[] args){
       java.awt.Toolkit.getDefaultToolkit().beep();

       //or

       System.out.println((char)7);
   }

}</lang>

Julia

Works with: Linux

<lang Julia> println("This should ring a bell.\a") </lang>

Output:

This should ring a bell.

And it does, provided that the bell is enabled on your terminal.

Lasso

<lang Lasso>stdoutnl('\a')</lang>

Logo

Lua

<lang lua>print("\a")</lang>

Mathematica

<lang Mathematica>Print["\007"]</lang>

Nemerle

<lang Nemerle>using System.Console;

module Beep {

   Main() : void
   {
       Write("\a");
       System.Threading.Thread.Sleep(1000);
       Beep();
       System.Threading.Thread.Sleep(1000);
       Beep(2600, 1000); // limited OS support
   }

}</lang>

NetRexx

<lang NetRexx>/* NetRexx */ options replace format comments java crossref symbols binary

runSample(arg) return

-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ method runSample(arg) private static

 do
   BEL = 8x07
   jtk = java.awt.toolkit.getDefaultToolkit()
   say 'Bing!'(Rexx BEL).d2c
   Thread.sleep(500)
   say 'Ding\x07-ding\u0007!'
   Thread.sleep(500)
   say 'Beep!'
   jtk.beep()
 catch ex = Exception
   ex.printStackTrace()
 end
 return

</lang>

Nim

Objeck

<lang objeck>7->As(Char)->PrintLine();</lang>

PARI/GP

Works with: PARI/GP version 2.7.4 and above

<lang parigp>\\ Ringing the terminal bell. \\ 8/14/2016 aev Strchr(7) \\ press <Enter></lang>

or

<lang parigp>print(Strchr(7)); \\ press <Enter></lang>

Output:

(11:12) gp > Strchr(7) \\ press <Enter>
%6 = ""
(11:13) gp > print(Strchr(7)); \\ press <Enter>

(11:14) gp >

Pascal

See Delphi

Perl

<lang perl>print "\a";</lang>

Perl 6

<lang perl6>print 7.chr;</lang>

PHP

PicoLisp

PL/I

<lang pli> declare bell character (1);

  unspec (bell) = '00000111'b;
  put edit (bell) (a);</lang>

PostScript

The following will only work in a PostScript interpreter that sends output to a terminal. It will very likely not make a printer beep. <lang postscript>(\007) print</lang>

PowerShell

One can either use the ASCII BEL character which only works in a console (i.e. not in a graphical PowerShell host such as PowerShell ISE): <lang powershell>"`a"</lang> or use the .NET Console class which works independent of the host application: <lang powershell>[Console]::Beep()</lang>

PureBasic

<lang PureBasic>Print(#BEL$)</lang>

Python

<lang python>print "\a"</lang>

R

<lang R>alarm()</lang>

Racket

lang racket

(require (planet neil/charterm:3:0)) (with-charterm

(void (charterm-bell)))

</lang>

Retro

REXX

There is no standard REXX built-in function to handle the sounding of the bell or a PC's speaker. However, some REXX interpreters have added a non-stardard BIF. <lang rexx>call beep(freq [,duration]) /*supported (kinda) by Regina. */

call sound(freq [,duration ]) /*supported by PC/REXX. */

say '07'x /*works under the Windows DOS shell.*/

say copies('07'x,100) /*as above, but much more annoying. */</lang>

 begin
   write("\a");
 end func;</lang>

<lang sh>#!/bin/sh

Ring the terminal bell
echo "\a" # does not work in some shells

tput bel</lang>

X86 Assembly

<lang X86 Assembly>;Assemble with: tasm; tlink /t

       .model  tiny
       .code
       org     100h            ;.com files start here

start: mov ah, 02h ;character output

       mov     dl, 07h         ;bell code
       int     21h             ;call MS-DOS
       ret                     ;return to MS-DOS
       end     start</lang>

XPL0

<lang XPL0>code ChOut=8; ChOut(0,7)</lang>

zkl

<lang zkl>print("\x07");</lang>