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Docs: Add avol(1)

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Andreas Kling 2019-11-22 21:52:52 +01:00
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## Name
avol - Change system sound volume
## Synopsis
```**sh
$ avol [-m] [-M] [volume]
```
## Description
This program is used to control the AudioServer volume and muted state.
## Options
* `-m`: Mute all audio.
* `-M`: Unmute all audio.
## Examples
```sh
# 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
```