How do I update java Mac terminal?

To entirely use a (bash) shell to update java Mac terminal e.g. Java 8u112 JRE do the following:

Download:
cd ~/Downloads
curl -v -j -k -L -H "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u112-b15/jre-8u112-macosx-x64.dmg > jre-8u112-macosx-x64.dmg
Mount:
hdiutil attach jre-8u112-macosx-x64.dmg
Install:
sudo installer -pkg /Volumes/Java 8 Update 112/Java 8 Update 112.app/Contents/Resources/JavaAppletPlugin.pkg -target /
Clean-up:
diskutil umount /Volumes/Java 8 Update 112 
rm jre-8u112-macosx-x64.dmg
To install the latest Oracle JDK (at the time of writing this answer it's Java 8u121 JDK) the various paths (besides the version number) are slightly different compared to the older JRE version. The URL contains an additional directory (i.e. /e9e7ea248e2c4826b92b3f075a80e441) and the dmg file contains a .pkg file instead of an installer app:
cd ~/Downloads
curl -v -j -k -L -H "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-macosx-x64.dmg > jdk-8u121-macosx-x64.dmg
hdiutil attach jdk-8u121-macosx-x64.dmg
sudo installer -pkg /Volumes/JDK 8 Update 121/JDK 8 Update 121.pkg -target /
diskutil umount /Volumes/JDK 8 Update 121rm jdk-8u121-macosx-x64.dmg