First you need to compute hash of your e-mail.

echo -n "[email protected]" | sha256sum

Than you can download it using curl. Replace HASH with the output from the previous command.

curl -fL "https://www.gravatar.com/avatar/HASH?s=500&d=404" -o avatar.jpg

Parameters

• s=500 (Gravatar supports 1–2048px size)
• d=404 (If there is no image return HTTP 404)
• r=pg|r|x (To change rating)

See more information on Gravatar docs.