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I tried to use browsers' console, but it interprets print as command to print a document, not as output on the console. I heard about some JavaScript Shell, but didn't quiet get how to install and use it. I need to run just trivial console Javascript programs.

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    In JS, console.log is for output, not print. – Ray Wu Dec 6 '20 at 19:36
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The easiest way to run JavaScript on your desktop is probably thorugh NodeJS. Install it with:

apt install nodejs

Then if you create a file named hello.js like this...

console.log("Hello!");

...you can execute it like this:

$ node hello.js
Hello!

NodeJS comes with several modules for various tasks, including interacting with your desktop and creating graphical applications. Use apt search ^node- to list those packaged for Ubuntu, or check out NPM for many other third-party packages.

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