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#!/bin/sh
# vol - get/set volume of alsa control using amixer
# $1: control name (default is 'Master')
# $2: set the volume to value (optional)
amixer \
$( [ -z "$2" ] && echo "get" || echo "set" ) \
$( [ -z "$1" ] && echo "Master" || echo "$1" ) \
"$2" \
| sed -nE -e '/\[on\]/ { s/.*\[([0-9]+%)\].*/\1/; p; q }' \
-e '/\[off\]/ { s/.*/MUTE/; p; q }'
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