Generating a notification sound in command-line
You want to play a notification sound in a Linux shell script, but don’t want to download any sound files (e.g. MP3, WAV, MIDI). Here is a script that generates the sound on-the-fly:
First install SoX, the Swiss Army knife of sound processing programs.
sudo apt-get install sox
play -n synth 0.3 pluck A3 vol -20dB repeat 2
play: the player command from SoX.
-n: Play a “null file”.
synth 0.3 pluck A3: Play the A3 (220.00 Hz) sound for 0.3 seconds, with a waveform that simulates a guitar string pluck.
vol -20dB: The default is too loud, reduce the volume by -20dB.
repeat 2: Repeat twice (i.e., total 3 times).