system/programs/xmonad/xmobar/scripts/get_volume.sh

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#!/bin/bash
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enabled=$(amixer -D pulse sget Master | egrep -o "\[on\]" | wc -l)
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if [[ $enabled == "0" ]]; then
echo "off"
else
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echo $(amixer -D pulse sget Master | egrep -o "[0-9]+%" | head -n 1)
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fi
exit 0