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amixer:tldr:b32b2
amixer: Turn up the master volume by 10%.
$ amixer -D pulse sset Master ${10%+}
try on your machine
The command "amixer -D pulse sset Master ${10%+}" is used to control the volume of the PulseAudio sound server using the "amixer" command-line tool.
Here's a breakdown of the command:
- "amixer" is the command-line tool in Linux used to control audio settings.
- "-D pulse" specifies that the target audio device is the "pulse" sound server (PulseAudio).
- "sset" is short for "simple set" and is used to set the value of a control element.
- "Master" is the name of the control element representing the master volume control.
- "${10%+}" is a parameter expansion syntax that takes the value of the 10th argument passed to the command and removes the trailing "+" character, if present.
In summary, this command sets the volume of the PulseAudio master audio control using the value specified as the 10th parameter (presumably passed from another part of the script). The trailing "+" character is removed from the value before setting the volume.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.