SFTP with Curl
This HN comment enlightened me.
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To download a file:
curl -u david:$(op item get flounder --fields label=password) \
-O sftp://flounder.online:2024/index.gmi
To upload a file:
curl -u david:$(op item get flounder --fields label=password) \
sftp://flounder.online:2024 --upload-file index.gmi