How do I check what user agent curl is using?

Try this

curl ifconfig.me/ua

However the output would be "Curl and your curl version"

for example:

curl/7.64.0

Use the --verbose option to see all the headers sent by curl, including User-Agent:

A line starting with '>' means "header data" sent by curl

For example:

$ curl --verbose 'http://www.google.com/'
> GET / HTTP/1.1
> User-Agent: curl/7.37.0
> Host: www.google.com
> Accept: */*

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