If you are using a Linux distribution which manages sound using PulseAudio, you can still use amixer to change the master volume or to mute/unmute your speakers via command line.
As an example, to decrease the master volume by 5%, run:
amixer -D pulse sset Master 5%-
Similarly, to increase the master volume by 5%, run:
amixer -D pulse sset Master 5%+
To mute your speakers, run (you may also use unmute):
amixer -D pulse sset Master mute
Finally, you may toggle the "muted" state of your speakers with this command:
amixer -D pulse sset Master toggle
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