Get temperature and store in file, openweathermap

gettemp.sh

#!/bin/sh

API_KEY=""
CITY="Hamburg,de"
OUTPUT_FILE="/run/user/$(id -u)/gettemp.temperature"
RESULT=""
RETRY=0

if [ "${1}" != "" ]; then
	CITY="${1}"
fi

# Try 2 times to fetch temperature
while [ ${RETRY} -lt 2 ]; do
	RESULT=$(curl -s http://api.openweathermap.org/data/2.5/weather\?appid\=${API_KEY}\&q\=${CITY}\&units\=metric \
	| sed 's/^.*temp":\(-\?[0-9\.]*\),.*$/\1/')

	# HTTP errors are returned as HTML document,
	# connection failures as "failed to connect".
	# If response is too long to be valid, discard.
	# If it seems valid, write to file and exit.
	if [ $(echo ${RESULT} | wc -c) -lt 10 ]; then
		RESULT=$(echo "scale=1; x = ${RESULT}; if (x > 0) x = x + 0.05; if (x < 0) x = x - 0.05; x / 1" \
			| bc | sed -r 's/^(-?)\./\10\./') # Round
		echo "${RESULT}" > ${OUTPUT_FILE}
		break
	fi

	RETRY=$(expr ${RETRY} + 1)
	sleep 5
done