update-alternatives

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

• Add a symbolic link:

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

• Configure a symbolic link for java:

sudo update-alternatives --config java

• Remove a symbolic link:

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

• Display information about a specified command:

update-alternatives --display java

• Display all commands and their current selection:

update-alternatives --get-selections