Get latest Oracle JDK package bash shell script for linux/osx/windows

get_oracle_jdk_x64.sh

#!/bin/bash

# You must accept the Oracle JDK License Update
# https://www.oracle.com/java/technologies/javase-downloads.html
# usage: get_oracle_jdk_x64.sh <jdk_version> <platform> <ext>
# jdk_version: 14
# platform: linux or osx or windows
# ext: rpm or dmg or tar.gz or exec

jdk_version=${1:-14}
platform=${2:-linux}
ext=${3:-rpm}

readonly url="https://www.oracle.com"
readonly jdk_download_url1="$url/java/technologies/javase-downloads.html"
readonly jdk_download_url2=$(
    curl -s $jdk_download_url1 | \
    egrep -o "/\java\/technologies\/javase-jdk${jdk_version}-downloads.html"
)

[[ -z "$jdk_download_url2" ]] && echo "Could not get jdk download url - $jdk_download_url1" >> /dev/stderr

readonly jdk_download_url3="${url}${jdk_download_url2}"
readonly jdk_download_url4=$(
    curl -s $jdk_download_url3 | \
    egrep -o "download.oracle\.com\/otn-pub\/java\/jdk\/(${jdk_version})\..*\/.*\/jdk-${jdk_version}\..*[_]${platform}-x64_bin.${ext}\'" | tr -d \'
)

for dl_url in ${jdk_download_url4[@]}; do
    wget --no-cookies \
         --no-check-certificate \
         --header "Cookie: oraclelicense=accept-securebackup-cookie" \
         -N $dl_url
done