Package: pulseaudio-utils Version: 16.1+dfsg1-5.1 Debian's pactl supports "get-sink-volume" subcommand:
% pactl help | grep 'get-.*sink.*volume' pactl [options] get-(sink|source)-volume NAME|#N and this subcommand is listed in shell completion upstream: https://github.com/pulseaudio/pulseaudio/blob/master/shell-completion/zsh/_pulseaudio#L269 but not in debian autocompletion, which is therefore obsolete % grep get-sink-volume /usr/share/zsh/vendor-completions/_pulseaudio %