| => amixer set Master 85% #范围 整数% 0%~100% Simple mixer control ‘Master‘,0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 74 Mono: Playback 63 [85%] [-11.00dB] [on]
原文：http://my.oschina.net/dengwo/blog/423161