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What about cat example.txt?

No browser needed. No GUI. Works offline.

Surely that's simpler?

it's also not an editor.

Would cat >> example.txt be one, however?

Yes, and it is my preferred method of editing `.gitignore` files:

cat >> .gitignore

*.pyc

^D

but you need the cat executable and CLI environment. Harder to do these days than double clicking on the browser icon.