update-alternatives

Convenientily maintain symbolic links to determine default commands. More information: https://manned.org/update-alternatives.

sudo update-alternatives --install path/to/symlink command_name path/to/command_binary priority

sudo update-alternatives --config java

sudo update-alternatives --remove java /opt/java/jdk1.8.0_102/bin/java

update-alternatives --display java

update-alternatives --get-selections