Provided by: beep_1.4.9-1build1_amd64 bug

NAME

       beep - beep the pc speaker any number of ways

SYNOPSIS

       beep [GLOBALS] [-f FREQ] [-l LEN] [-r REPEATS] [<-d|-D> DELAY] [-s] [-c]
       beep [GLOBALS] <TONE_OPTIONS> [-n|--new] <TONE_OPTIONS>
       beep <-h|--help>
       beep <-v|-V|--version>

DESCRIPTION

       beep  allows  the user to control the PC speaker with precision, allowing different sounds
       to indicate different events.  While beep can be run quite happily on  the  command  line,
       beep's  intended  use  is  within  shell/perl  scripts,  notifying the user when something
       interesting occurs.  Of course, it has no notion of what IS interesting, but it is good at
       the notifying part.

       All  options have default values, meaning that just typing 'beep' will work.  If an option
       is specified more than once  on  the  command  line,  subsequent  options  override  their
       predecessors.  So 'beep -f 200 -f 300' will beep at 300Hz.

       All durations are given in a unit of milliseconds, frequencies as Hertz, and the number of
       repeats is a dimensionless number.

OPTIONS

   Global options
       -e DEVICE, --device=DEVICE
              Explicitly set the device beep shall use to generate beep tones.  When not given  a
              device  explicitly, beep runs through an internal list of devices until one appears
              to work.

       --debug, --verbose
              Make the beep program more verbose.

   Tone options
       -f FREQ
              Beep with a tone frequency of FREQ Hz, where 0  <  FREQ  <  20000.   As  a  general
              ballpark,  the regular terminal beep is around 750Hz.  For backwards compatibility,
              you can give FREQ as a floating point number, but beep will round that  to  integer
              values as the kernel APIs expect them.  Default value: 440 Hz.

       -l LEN Beep for a tone length of LEN milliseconds. Default value: 200 ms.

       -r REPEATS
              Repeat  the  tone  including  delays  REPEATS  times.  Default  value:  1 tone, not
              repeated.

       -d DELAY | -D DELAY
              Specify a delay  of  DELAY  milliseconds  between  repetitions.   Small  letter  -d
              specifies  that  this delay should only occur between beeps, that is, it should not
              occur after the last repetition.  Capital letter -D specifies that the delay should
              occur  after  every repetition, including after the last one.  Normally, -d is what
              you want, but if, for example, you are stringing several beep commands together  to
              play  the  star  wars anthem, you may want control over every delay. Default value:
              100 ms delay between beeps with no delay after the last beep.

       -n, --new
              The --new option allows you to chain multiple beeps together on  a  single  command
              line.   Each  time the --new is used, beep starts treating all further arguments as
              though they were for a new beep.  So for example:

                  beep -f 1000 -n -f 2000 -n -f 1500

              would produce a sequence of three beeps, the first with a frequency of 1000Hz  (and
              otherwise  default  values),  then a second beep with a frequency of 2000Hz (again,
              with things like delay and reps being set to their defaults), then a third beep, at
              1500Hz.   This  is  different from specifying a -r value, since -r repeats the same
              beep multiple times, whereas --new allows you to specify different beeps.  After  a
              --new, the new beep is created with all the default values, and any of these can be
              specified without altering values for preceding (or later) beeps.  See the EXAMPLES
              section if this managed to confuse you.

       -s, -c Both  the  -s  and  the -c option put beep into input processing mode, reading from
              stdin and copying all received data to stdout.  This makes it  easy  to  slip  beep
              into  a  text processing pipeline to acoustically monitor the data flow within that
              pipeline.  See the EXAMPLES section.

              -c     Beep after every character received.

              -s     Beep after every set of data received.  Usually, this means  after  newlines
                     occur in text processing pipes.

              In  a  sequence  of notes specified with one or more occurrences of -n or --new, it
              only makes sense to have one single note marked with either -s or  -c  attached  to
              it.   Then  beep will beep all notes until it reaches that marked note, then repeat
              the marked note according to the input it receives, and once the input has  reached
              EOF, beep will continue with the remainder of the note sequence.

              The behaviour of beep with more than one note marked with -s or -c is undefined.

   Other Actions
       -h, --help Display beep usage info and exit.

       -v, -V, --version
              Display beep version information and exit.

EXIT STATUS

       When successful, beep returns with exit code 0.

       Any non-0 exit code means beep has encountered an error and has bailed out.

ENVIRONMENT

       BEEP_LOG_LEVEL
              When  set  to  a  number  between  -999 and 999, BEEP_LOG_LEVEL will be used as the
              default loglevel until overridden by a command line parameter.

FILES

       The device files beep uses by default are the following:
           /dev/input/by-path/platform-pcspkr-event-spkr
           /dev/tty0
           /dev/vc/0

NOTES

   Devices and Permissions
       When you run beep without explicitly giving a  device  to  use,  beep  tries  opening  the
       following devices in sequence until one succeeds:

       /dev/input/by-path/platform-pcspkr-event-spkr
           Uses  the evdev API, and system administrator can allow access to any set of users and
           groups using the normal file permissions.

       /dev/tty0
           Uses the console API, and the kernel insists you are root or own the TTY.

       /dev/vc/0
           Uses the console API, and the kernel insists you are root or own the TTY.

       beep does not support running as setuid root or via sudo(1).

       For non-root uses, the system administrator can set up  a  udev(7)  rule  to  allow  write
       access  to  /dev/input/by-path/platform-pcspkr-event-spkr  for  certain  users and/or user
       groups. For details, see the beep /usr/share/doc/beep/PERMISSIONS.md file.

   APIs
       evdev
           Uses  the   input   event   device   driver,   which   means   running   write(2)   on
           /dev/input/by-path/platform-pcspkr-event-spkr.

           The  permissions  to  this  device file can be set up such that beep can be run by any
           non-root user the system administrator wants to.

           Opening this device takes on the order of magnitude of 20ms in the  Linux  kernel  for
           every  time  you start the beep command. Therefore, if you need to play multiple notes
           in a rhythmical sequence for a melody, use one beep command invocation  with  multiple
           notes, not several beep invocations playing one note each.

       console
           Uses  the  ancient  console  API,  which means running the KIOCSOUND ioctl(2) on a tty
           device like /dev/tty0 or /dev/vc/0.

           This requires being root, unless the non-root user happens be logged into the  virtual
           console  and  be  using that specific virtual console device like e.g. /dev/tty4. This
           makes the console driver useless for non-root users logged in via ssh, and  often  X11
           or Wayland.

           Use the evdev API instead.

   Concurrent Invocations
       Concurrent  invocations of beep are not supported. There is only one tone generator in the
       PC hardware, and we do not manage access to that shared resource in  any  way.   So  if  a
       first  beep  -f  1000  -l  10000  process  starts a long 10 second beep with 1000Hz, and 2
       seconds later a second quick beep -f 2050 -l 100 with 2050Hz comes in, you will hear  that
       2050Hz beep for 100ms, and then silence as the quick beep silences the tone generator. Now
       you will not hear that the first beep process is still running after having waited for the
       first  2100ms  of  its  10000ms.  You  will also not hear that the first beep process will
       silence the already silent speaker  7900ms  later,  i.e.  10000ms  after  the  first  beep
       started.

   Sound Volume
       The PC speaker hardware has no way to explicitly set the volume of a beep.

       If you have a standalone PC, however, chances are you have a piezo beeper connected to the
       mainboard.  If you prioritize a loud beep over a certain frequency beep, you can choose to
       beep  at  a frequency close to the resonance frequency of the piezo beeper.  Typical piezo
       beepers have a resonance frequency around 2000Hz, so you can test frequencies around  that
       range.  The author's piezo beeper is the loudest at about 2050Hz.

       If  you  have  a  PC  laptop,  chances  are  that your laptop will not have a piezo beeper
       hardware inside and that it will route the output of the pcspkr circuit  to  the  laptop's
       internal  speakers via the sound card mixer.  In that case, you can and/or must change the
       mixer level for the beeper using a sound card mixer application.

   Frequency Table
       This frequency table might come in handy for translating  musical  notes  to  frequencies.
       The  frequencies  are  rounded  to  integer  numbers  as the kernel driver only works with
       integers.  The column for octave 4 is the octave of middle C.

                                    ┌─────┬─────────────────────────┐
                                    │noteoctave          │
                                    │name3     4     5      6   │
                                    ├─────├─────────────────────────┤
                                    │ C   │ 131   262    523   1047 │
                                    │ C#  │ 139   277    554   1109 │
                                    │ D   │ 147   294    587   1175 │
                                    │ D#  │ 156   311    622   1245 │
                                    │ E   │ 165   330    659   1319 │
                                    │ F   │ 175   349    698   1397 │
                                    │ F#  │ 185   370    740   1480 │
                                    │ G   │ 196   392    784   1568 │
                                    │ G#  │ 208   415    831   1661 │
                                    │ A   │ 220   440    880   1760 │
                                    │ A#  │ 233   466    932   1865 │
                                    │ B   │ 247   494    988   1976 │
                                    │ C   │ 262   523   1047   2093 │
                                    └─────┴─────────────────────────┘

BUGS

       Report bugs to ⟨https://github.com/spkr-beep/beep/issues⟩.

EXAMPLES

       At its simplest (yet still effective)

           beep

       A more interesting standalone setup

           beep -f 300.7 -r 2 -d 100 -l 400

       As part of a log watching pipeline

           tail -f /var/log/xferlog | grep 'passwd' | beep -f 1000 -r 5 -s

       When using -c mode, I recommend using a short -D, and a shorter -l, so that the  beeps  do
       not   blur   together.    Something   like  this  will  get  you  a  cheesy  1970's  style
       beep-as-you-type-each-letter effect

           cat file | beep -c -f 400 -D 50 -l 10

       A highly contrived example of -n/--new usage

           beep -f 1000 -r 2 -n -r 5 -l 10 --new

       will produce first two 1000Hz beeps, then 5 beeps at the default tone, but only 10ms  long
       each, followed by a third beep using all the default settings (since none are specified).

SEE ALSO

       /usr/share/doc/beep/README.md,                         /usr/share/doc/beep/PERMISSIONS.md,
       ⟨https://github.com/spkr-beep/beep⟩