Here is "Hello, world!" in Python:
```
print("Hello, world!")
```
Save is as file `hello.py`. You can run it using `python3 hello.py`.


JavaScript version, as usable in HTML page:
```
<script>
  alert('Hello, world!');
</script>
```

Another JavaScript version, which greets you by logging text into console:
```
console.log("Hello, world!")
```
Example usage: run the code in JavaScript console or save it as file `hello.js` and run it using `nodejs hello.js`.
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