回答編集履歴
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情報元のさらに情報元が見つかったのでご紹介します
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pacmd set-source-volume < index > 0x8000
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# < index >はそれぞれ機器による
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```
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とすることでうまくいきました。
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とすることでうまくいきました。
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**追加情報**
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上記ご紹介しましたwebサイトの元ネタは以下の WebSite のようです。
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[How can I change the default audio device from command line?](https://askubuntu.com/questions/14077/how-can-i-change-the-default-audio-device-from-command-line)
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Ubuntu's desktop gui is great for changing audio settings (System->Preferences->Sound), like the default input/output device and setting the volume.
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However, I would like to be able to do these things from the command-line. What tool is the gui using behind the scenes?
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**Answer**
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You can control PulseAudio thoroughly through the command line using pacmd and pactl commands. For options see pacmd --help or the wiki at PulseAudio:
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```shell
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pacmd list-sinks for name or index number of possible sinks
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pacmd list-sources for name or index number of possible sources
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pacmd set-default-sink "SINKNAME" | index to set the default output sink
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pacmd set-default-source "SOURCENAME" | index to set the default input
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pacmd set-sink-volume index volume
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```
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