Linux: Change Volume by Command
Here's shell command to change sound volume.
# increase sound level amixer set Master 8%+ # decrease sound level amixer set Master 8%-
# set to specific sound level amixer set Master 50%
you can setup a key such as 【❖ Super+↑】 ＆ 【❖ Super+↓】 to adjust sound level. See Linux: Keyboard Software Guide ⌨.
mute and unmute
# mute amixer set Master mute # need to run all the following to unmute amixer set Master unmute amixer set Headphone unmute amixer set PCM unmute amixer set Front unmute amixer set Surround unmute amixer set Center unmute amixer set LFE unmute amixer set Side unmute
thanks to Adam Arvidsson
Interactively Adjust Sound Level in Terminal
Here's how to change sound interactively in terminal.
Start alsamixer in terminal.
# show a text gui mixer control panel alsamixer
Then, you can use up/down arrow keys to adjust volume.
Mouse scroll-wheel also works, if your terminal supports it.