Linux/Alternatives

Configure

sudo update-alternatives --config java

There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                      Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      auto mode
  1            /usr/bin/gij-4.4                           1044      manual mode
  2            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      manual mode
  3            /usr/lib/jvm/java-6-sun/jre/bin/java       63        manual mode

Press enter to keep the current choice[*], or type selection number:

reference: https://stackoverflow.com/questions/12787757/how-to-use-the-command-update-alternatives-config-java

Install

--install <link> <name> <path> <priority>

sudo update-alternatives --install /tmp/randomStuff java /usr/local/java/jre1.7.0_25/bin/java 0

reference: https://unix.stackexchange.com/questions/81992/better-way-to-add-alternative-using-update-alternatives

Python 3.14

# Ubuntu/Debian
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.14-dev python3.14-venv

# RHEL/CentOS
sudo yum install python3.14 python3.14-pip

sudo update-alternatives --list
sudo update-alternatives --list python

sudo update-alternatives --display python3
sudo update-alternatives --display python
sudo update-alternatives --display pip3
sudo update-alternatives --display pip

# sudo update-alternatives --config python

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.12 312
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.14 314
sudo update-alternatives --set python3 /usr/bin/python3.14

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.12 312
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.14 314
sudo update-alternatives --set python /usr/bin/python3.14

sudo update-alternatives --install /usr/bin/pip3 pip3 /usr/bin/pip3.12 312
sudo update-alternatives --install /usr/bin/pip3 pip3 /usr/bin/pip3.14 314
sudo update-alternatives --set pip3 /usr/bin/pip3.14

sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3.12 312
sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3.14 314
sudo update-alternatives --set pip /usr/bin/pip3.14