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获取 OS X 终端 CLI 中的当前音量级别？

tag-icon • tag-icon command-line osx audio volume
获取 OS X 终端 CLI 中的当前音量级别？

我想通过 Mac 上的 CLI 检查当前音量级别。我知道我可以这样设置：

osascript -e 'set volume <N>'

但在尝试获取当前音量级别时，这似乎不起作用。

$ osascript -e 'get volume'
4:10: execution error: The variable volume is not defined. (-2753)

答案1

您应该发现它将get volume settings返回一个对象，其中包含输出量和警报量。例如，您可以这样做来检索整个对象：

osascript -e 'get volume settings'

或者更确切地说，这可能只是获取输出量（例如，而不是警报量）：

osascript -e 'set ovol to output volume of (get volume settings)'

...但请注意，并非所有音频设备都可以通过软件直接控制音量设置。例如，您的显示音频应该具有控制权；然而，火线或 USB I/O 板可能不会在软件控制下进行这些设置（因为它们可能是物理旋钮）。如果特定设置不受软件控制，那么它将在返回的对象中显示为get volume settings“缺失值”或类似的内容。

答案2

使用相同的比例 1..100 获取和设置音量：

# Get current volume as a number from 0 to 100
current_vol=$(osascript -e 'output volume of (get volume settings)')

# Prank co-worker by playing loud noise/music
osascript -e "set volume output volume 100"
afplay sabotage.m4a

# (Re-)set to saved volume as a number from 0 to 100
osascript -e "set volume output volume $current_vol"

答案3

我提交了一个非常简单的 bash 脚本，名为“chut”。因为我厌倦了 sys 卷需要浮点作为输入（0 到 10 步长 0.1），但输出步长 14 范围从 0 到 100 的整数。

想想看...如果有人感兴趣：http://github.com/docgyneco69/chut

尽显其荣耀：

#!/bin/bash
## CHUT script
## Note: regex [[:digit:]] requires a relatively recent shell
## easy to change with a sed cmd if needed
## applescript arg is not fully bullet proofed for sneaky cmds
## but as no outside arg is passed by the script I kept the usual
## arg format for code readibility (and pure laziness)

# init _x and curr_vol with defaults values (muting)
_x='- 100' ; curr_vol='0' ;

function _usage {echo -e "CHUT is a simple cmd exe to change the system audio volume.
USAGE chut [][-][--][+][++]
      no arg will mute (default)
      [-][+] [--][++] to decrease or increase the volume
      [+++] to set to the maximum
      [-h][--help] display this message
NOTE sys sets volume as float (0-10/0.1) but outputs int (0-100/14)" ; exit 1 ; } ;

# set _x by looping $1 then break as we only use 1st arg, -h or --help to print usage
while [[ "$1" ]]; do case "$1" in
    "-h"|"--help")  _usage      ;;
    "-")        _x='- 0.5'  ;;
    "--")       _x='- 1.0'  ;;
    "+")        _x='+ 0.5'  ;;
    "++")       _x='+ 1.0'  ;;
    "+++")      _x='+ 100'  ;;
    *)      _x='- 100'  ;; # unrecognized values will mute
esac ; break ; done ;

# get current volume value from system (sys volume is 0 to 100 step 14)
curr_vol=$(/usr/bin/osascript -e "get volume settings" | cut -d ',' -f1 | tr -dc [[:digit:]]) ;

# set new volume via _x - use bc for floating point, escape potential errors, 
# print value with one decimal - test & echo the new volume value via applescript
curr_vol=$( printf "%.1f" "$( echo "$curr_vol / 14 $_x" | bc -l 2>&-)" ) ;
(/usr/bin/osascript -e "set Volume "\"$curr_vol"\" ") && \
echo $(/usr/bin/osascript -e "get volume settings" | cut -d ',' -f1 | tr -dc [[:digit:]]) ;

exit 0 ;

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