Check the version?

General Help
1

How can I check whether Python/Java is installed on my System and which version is installed ?? Because before moving to Zorin OS, I had installed both of these..

2

In terminal:

python --version

java -version
3

Python is installed.

But should I install Java from its official website or directly by the command given by the terminal ?

java --version

Command 'java' not found, but can be installed with:

sudo apt install default-jre            
sudo apt install openjdk-11-jre-headless
sudo apt install openjdk-8-jre-headless
4

I have some experience with Python to managed my troops of RaspberryPi at home. But I have zero experience with Java. I hope other members @Aravisian @337harvey @zabadabadoo who have more experience could help you.

6

Java is interesting in that to find the version you must use:

java -version

This is different from most where it is

"Program-Name" --version

I am not sure why this is. But it helps to know for future reference.

The first question is, should you install Java? Unless you have software that specifies a need for it; then I would not recommend installing it.

The next question is whether to install from Oracle or from Repo. These days, either. the sudo apt install default-jre should suit your needs if you need it.
In Zorin 12.4 and in 15.3, I would have recommended that it be installed directly from the Oracle Website as the Ubuntu Main Universe version contained a bug that was quite a problem. In Zorin 16 (Based on Ubuntu 20.04) that has been fixed and is not an issue at this time.

7

I did not eve give it a thought till you point out!
It is indeed true.

I usually expect an abbreviated argument after single hyphen and a full argument after double hyphens. For example, -h and --help.

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