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diff --git a/sh/il b/sh/il
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+#!/bin/sh
+# InterpoLation
+
+# x=$1, xa=$2, xb=$3, ya=$4, yb=$5
+# https://en.wikipedia.org/wiki/Interpolation#Linear_interpolation
+echo "scale=4;$4+($5-$4)*($1-$2)/($3-$2)" | bc