herbstluftwm/bin/herbstluftwm-add-gap


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#!/bin/sh
filename="/tmp/herbstluftwm-gap"
while read -r line
do
	gap=$line
	if [ "$gap" -le 90 ]
	then
		gap=$((gap+7))
		herbstclient set window_gap $gap
		echo $gap > $filename
	fi
done < "$filename"