avol - Change system sound volume
$ avol [-m] [-M] [volume]
This program is used to control the AudioServer volume and muted state.
-m
: Mute all audio.-M
: Unmute all audio.# Set the volume to 100
$ avol 100
Volume: 100
# Get the current volume
$ avol
Volume: 80
# Mute all audio
$ avol -m
# Unmute all audio
$ avol -M