How to migrate from initscripts to systemd on Archlinux

In this how to I will describe how to migrate from initscripts to the “new” systemd init system on Archlinux. Initscripts will still work, but it is recommended to switch completely to systemd.

1. Update and installation
2. Migration and configuration
3. Optional improvements
4. Useful commands
5. Troubleshooting

How to change the Java version/enviroment in Ubuntu

If you have installed multiple Java-Versions and you want to configure your system to use one of them as the default, there is a really simple command to achieve that goal:

1) Check Java version

$ java -version

• The output should look similar to something like this:

  java version "1.7.0_147-icedtea"
  OpenJDK Runtime Environment (IcedTea7 2.0) (7~b147-2.0-0ubuntu0.11.10.1)
  OpenJDK 64-Bit Server VM (build 21.0-b17, mixed mode)
  

  As you can see my systems default is set to java-7-openjdk (1.7.0_147-icedtea).