Mac shell 调节音量
$ osascript -e \'get volume settings\'
$ osascript -e \'output volume of (get volume settings)\'
$ osascript -e \'set volume output volume 10\' # 1-100
$ osascript -e \'get volume settings\'
$ osascript -e \'output volume of (get volume settings)\'
$ osascript -e \'set volume output volume 10\' # 1-100
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