Install Oracle JDK 9 from command-line on Ubuntu

install-jdk-9.sh

#!/bin/sh

# Download from Oracle's site - sadly no https.
wget --no-cookies --timestamping --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/9+181/jdk-9_linux-x64_bin.tar.gz --directory /tmp

# Decompress package into /opt/java
if [ ! -d "/opt/java" ]; then
  mkdir /opt/java
fi
tar zxvf /tmp/jdk-9_linux-x64_bin.tar.gz --directory /opt/java

# Update path references in system profile and make it default
echo 'export JAVA_HOME=/opt/java/jdk-9' > /etc/profile.d/jdk.sh
echo 'export PATH=$PATH:$HOME/bin:$JAVA_HOME/bin' >> /etc/profile.d/jdk.sh
chmod +x /etc/profile.d/jdk.sh
sudo update-alternatives --install "/usr/bin/java" "java" "/opt/java/jdk-9/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/java/jdk-9/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/opt/java/jdk-9/bin/javaws" 1
sudo update-alternatives --set java /opt/java/jdk-9/bin/java
sudo update-alternatives --set javac /opt/java/jdk-9/bin/javac
sudo update-alternatives --set javaws /opt/java/jdk-9/bin/javaws

# Reload system profile
. /etc/profile

java -version