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#!/bin/sh
while true
do
volume="$(mpc volume | awk '{print $2}' | cut -f1 -d'%')"
choice="$(echo "plus\nmin" |
dmenu -g 2 -l 1 -p "$volume" |
sed 's/plus/+/;s/min/-/')"
test -z "$choice" && break
nb="$(dmenu -g 2 -l 1 -p "$volume$choice" < /dev/null)"
test -z "$nb" && break
mpc volume "$choice$nb"
done
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