Incorrect solution to a minor problem.
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rpi-check-overscan/check-overscan

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#!/bin/sh
configFile="/boot/firmware/config.txt";
found=;
while IFS= read -r line || [ -n "$line" ]; do
if [ "$line" = "disable_overscan=1" ]; then
found="1";
fi;
done < $configFile;
if [ ! $found ]; then
printf "
# Remove black borders
disable_overscan=1
" >> $configFile;
fi;