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#!/bin/sh
while true
do
volume="$(mpc volume | awk '{print $2}' | cut -f1 -d'%')"
choice="$(printf "plus\nmin\n" |
commander -d -c -p "$volume" |
sed 's/plus/+/;s/min/-/')"
[ "$choice" ] || break
nb="$(commander -c -p "$volume$choice" -i)"
[ "$nb" ] || break
mpc volume "$choice$nb"
done
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