How can I use accented Latin characters like these (or any other unicode char really) in my
echo statements comments?
À à Á á Â â Ã ã É é Ê ê Í í Ó ó Õ õ Ú ú Ç ç Ñ ñ
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Modern Unixes use utf-8, this is the same as 7bit-ascii, but has extension bytes for other unicode characters. If your terminal is set to utf-8, then you can paste in the characters in you question.
echo À à Á á Â â Ã ã
If you wish to type them, then I suggest enabling a compose key. Then you can type compose A ~ for Ã. Or compose : ) for ☺.