Play sound when command finishes

Question

What's an efficient way to get the terminal to play an alarm/sound when a command launched by user finishes?

It needs to be automatic so that I don't have to explicitly run a "beep" command after each command.

Answer 1

You can use beep, echo -en "\007" it is very basic thing which use speaker on MB, you do non need even sound card. But in now days it is often disabled. You can try this to enable it https://superuser.com/a/22769

In many distributions, you have PulseAudio, so you can play sound from CLI like this paplay /usr/share/sounds/freedesktop/stereo/complete.oga

Some other ways can be founded on https://askubuntu.com/questions/277215/how-to-make-a-sound-once-a-process-is-complete

[EDIT] Sorry, I didn't notice yours on every command edition. You can probably combine what is written before with trap to accomplish required behavior https://jichu4n.com/posts/debug-trap-and-prompt_command-in-bash/

# This will run before any command is executed.
function PreCommand() {
  if [ -z "$AT_PROMPT" ]; then
    return
  fi
  unset AT_PROMPT
}
trap "PreCommand" DEBUG

# This will run after the execution of the previous full command line.  We don't
# want it PostCommand to execute when first starting a bash session (i.e., at
# the first prompt).
FIRST_PROMPT=1
function PostCommand() {
  AT_PROMPT=1

  if [ -n "$FIRST_PROMPT" ]; then
    unset FIRST_PROMPT
    return
  fi

  paplay /usr/share/sounds/freedesktop/stereo/complete.oga
}
PROMPT_COMMAND="PostCommand"

Answer 2

play_sound(){
    local df="./somedirectory/music_file.wav";

    $(which cvlc)       \
        -q              \
        --play-and-exit \
        --gain=0.5      \   
            ${df}       \
        &>/dev/null     \   
        ;
    };

some_command;
play_sound;

You have to install command line vlc for it to work.
It's called cvlc.

 sudo apt-get install cvlc;