SASS Find unused variables

gistfile1.txt

#! /usr/bin/env bash
#
# checks your scss files for unused variables
#

if [ -z "$1" ]; then
    echo "Please specify a directory as the first argument."
    exit 1
fi
if [ ! -d "$1" ]; then
    echo "Not a valid directory."
    exit 1
fi

echo "Finding unused variables. This might take some time..."

vars=`find "$1" -type f -name "*.scss" -exec grep -h '^$[a-z_][^:]*' {} \; | sed 's/$\([a-z_][^:]*\).*/\1/'`
for var in $vars; do
    echo -n "\$"$var;
    find "$1" -type f -name "*.scss" -exec grep -h "$var" {} \; | wc -l
done | grep ' 1$'