update-alternatives

A convenient tool for maintaining 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