/usr/bin/mute is in aumix-common 2.9.1-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #! /bin/sh
# $Aumix: aumix/src/mute,v 1.2 2010/04/28 23:30:37 trevor Exp $
# Copyright (c) 2001, Ben Ford and Trevor Johnson
#
# Run this script to mute, then again to un-mute.
# Note: it will clobber your saved settings.
#
volumes=$(aumix -vq |tr -d ,)
if [ $(echo $volumes | awk '{print $2}') -ne 0 -o \
$(echo $volumes | awk '{print $3}') -ne 0 ]; then
aumix -S
aumix -v 0
else
aumix -L > /dev/null
fi
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