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#!/bin/bash
read ICAO
if ! echo "$ICAO" | grep -Eq "^([A-Z]|[a-z]){4}$" ; then
echo "error: invalid ICAO code!"
exit 1
fi
ICAO="$(echo "$ICAO" | tr "a-z" "A-Z")"
# aviationweather.gov
result1="$(curl -s https://aviationweather.gov/cgi-bin/data/metar.php?ids=$ICAO)"
# metar-taf.com
result2="$(curl -s "https://metar-taf.com/history/$ICAO" | grep -E "METAR $ICAO [0-9]{6}Z" | head -n1 | sed "s/^\s*METAR // ; s|</td>|| ; s/\s*$//")"
if [[ "$result1" > "$result2" ]] ; then
echo "$result1"
else
echo "$result2"
fi
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