to play sound from a script/bash/command line: there are multiple possibilities…

hostnamectl; # tested on 
   Static hostname: DebianLaptop
         Icon name: computer-laptop
  Operating System: Debian GNU/Linux 9 (stretch)
            Kernel: Linux 4.9.0-11-amd64
      Architecture: x86-64

# paplay seems to be part of the package:
apt install pulseaudio-utils; # Befehlszeilenwerkzeuge für den Soundserver PulseAudio
paplay Debian_Linux_Startup_Linux_Sound_Collection.ogg
# or with absolute paths:
/usr/bin/paplay /path/to/Debian_Linux_Startup_Linux_Sound_Collection.ogg

# alternative: vlc
apt install vlc
# if you have vlc player installed (apt-get install vlc)
cvlc --play-and-exit Debian_Linux_Startup_Linux_Sound_Collection.ogg
# problem: if one has configured vlc to loop the playlist
# it might not exit but keep repeating the sound

test sound:

Debian_Linux_Startup_Linux_Sound_Collection.ogg.tar

how to trigger sound play?

it definitely needs to happen as the user that is also is running/logged in to the x session/desktop otherwise one will get:

/scripts/start.sh
Connection failure: Connection refused
pa_context_connect() failed: Connection refused

under MATE and Cinnamon Desktop simply search for “startup applications” widget and add like this:

Links:

linux debian pulseaudio no sound reboot startup zero percent volume muted – add startup sound

 

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