Delete all posts by a user on entire site with API?

Development
13

Trying the curl command above:

curl -X GET "https://forums.mysite.me/posts.json?username=targetusername" \
-H "Api-Key: eb4065d56u7u6u65u54y54uy566575w4yer343434ac8a770cbeb274bf7f87" \
-H "Api-Username: AdminUsername"

So, it ran and fetched me the posts…but then I got this:

C:\Users\User>-H "Api-Key: eb4065d56u7u6u65u54y54uy566575w4yer343434ac8a770cbeb274bf7f87"
'-H' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\User>-H "Api-Username: AdminUsername"
'-H' is not recognized as an internal or external command,
operable program or batch file.

Is this normal or why is that happening?