According to cURL documentation http://curl.haxx.se/docs/manpage.html
-v, --verbose
Makes the fetching more verbose/talkative.
But I came across
curl -vvv -u name@foo.com:password http://www.example.com
What is the difference between -v and -vvv?
As of curl 8.10 -vvv is a thing
https://curl.se/docs/manpage.html#-v
Since curl 8.10, mentioning this option several times in the same argument increases the level of the trace output.
Using it twice, e.g. "-vv", outputs time (--trace-time) and transfer ids (--trace-ids), as well as enable tracing for all protocols (--trace-config protocol).
Adding a third verbose outputs transfer content (--trace-ascii %) and enable tracing of more components (--trace-config read,write,ssl).
A forth time adds tracing of all network components. (--trace-config network).