Downloading JDK via script

Oracle-jdk-downloader.sh

#!/bin/bash

URL=http://www.oracle.com/technetwork/java/javase/downloads/index.html
PAGE=$(mktemp)

echo "Downloading $URL"
elinks --dump $URL >> $PAGE

echo " + webpage for JDK 7"
PAGE_JDK7=$(sed -n '/Java se 7u[0-9]\+/I s/^.*\[\([0-9]\+\)]java se.*$/\1/Ip' $PAGE | head -1 )
UPDATE_JDK7=$(sed -n '/Java se 7u[0-9]\+/I s/^.*java se 7u\([0-9]\+\).*$/\1/Ip' $PAGE | head -1 )
PAGE_JDK7=$(awk "/ ${PAGE_JDK7}\. / {print \$2}" $PAGE)
URL_JDK7=$(curl -s $PAGE_JDK7 | grep -i 'Linux x64' | grep 'tar.gz' | grep -v 'demo' | sed -e 's/.*"\(http:[^"]\+\)".*$/\1/')


echo " + webpage for JDK 8"
PAGE_JDK8=$(sed -n '/Java se 8u[0-9]\+/I s/^.*\[\([0-9]\+\)]java se.*$/\1/Ip' $PAGE | head -1 )
UPDATE_JDK8=$(sed -n '/Java se 8u[0-9]\+/I s/^.*java se 8u\([0-9]\+\).*$/\1/Ip' $PAGE | head -1 )
PAGE_JDK8=$(awk "/ ${PAGE_JDK8}\. / {print \$2}" $PAGE)
URL_JDK8=$(curl -s $PAGE_JDK8 | grep -i 'Linux x64' | grep 'tar.gz' | grep -v 'demo' | sed -e 's/.*"\(http:[^"]\+\)".*$/\1/')

[ -f $PAGE ] && rm -f ${PAGE}

echo "Downlading JDK 7 \& 8"
for i in $(seq 7 8); do 
    (
        DOWNLOAD_URL=$(eval echo \${URL_JDK${i}})
        wget -q --no-check-certificate \
        --no-cookies \
        --header "Cookie: oraclelicense=accept-securebackup-cookie" \
        --output-document jdk$i.tar.gz $DOWNLOAD_URL 2>/dev/null && \
        echo " + Downloaded file jdk$i.tar.gz" || \
        echo " + Failed downloading $DOWNLOAD_URL"
    )&
done
wait