get-developer-tools-release-dates

#!/bin/sh

curl https://xcodereleases.com | awk -F '[<>]' '
BEGIN {
	m["Jan"] = 1
	m["Feb"] = 2
	m["Mar"] = 3
	m["Apr"] = 4
	m["May"] = 5
	m["Jun"] = 6
	m["Jul"] = 7
	m["Aug"] = 8
	m["Sep"] = 9
	m["Oct"] = 10
	m["Nov"] = 11
	m["Dec"] = 12
}
/class="name"/ {
	match($3, /[0-9]+(\.[0-9]+)+/)
	version = substr($3, RSTART, RLENGTH)
}
/class="release"/ { release = $3 }
/class="date"/ {
	split($3, date, " ")
	day = date[1] + 0
	month = m[date[2]]
	year = date[3] + 0
	if (release != "GM" && release != "Release")
		next
	output[++n] = sprintf("%s\t%04d-%02d-%02d", version, year, month, day)
}
END {
	while (n)
		print output[n--]
}
'