CONFIG_FILE=./config.yaml
PATTERN1="contrib"
PATTERN2="non-free"

cat ${CONFIG_FILE}

echo "Uncomment:"
echo "PATTERN1: sed -i \"/${PATTERN1}/s/^#.//g\" ${CONFIG_FILE}"
sed -i "/${PATTERN1}/s/^#.//g" ${CONFIG_FILE} #   (to uncomment)

echo "PATTERN2: sed -i \"/${PATTERN2}/s/^#.//g\" ${CONFIG_FILE}"
sed -i "/${PATTERN2}/s/^#.//g" ${CONFIG_FILE} #   (to uncomment)

cat ${CONFIG_FILE}

echo "Comment:"
echo "sed -i \"/${PATTERN1}/s/^/# /g" ${CONFIG_FILE}\" #   (to comment)
sed -i "/${PATTERN1}/s/^/# /g" ${CONFIG_FILE} #   (to comment)

echo "sed -i \"/${PATTERN2}/s/^/# /g" ${CONFIG_FILE}\" #   (to comment)
sed -i "/${PATTERN2}/s/^/# /g" ${CONFIG_FILE} #   (to comment)

cat ${CONFIG_FILE}