Nevermind, I think I've got it:

emacsclient -n "org-protocol:/capture?template=t*&*url=http%3a%2f%
> 2fduckduckgo%2ecom&title=DuckDuckGo"
>

I had a '?' rather than '&' after 'template=t'.

Matt

On Mon, Mar 5, 2018 at 10:28 AM, Matthew Woodbury <mattwoodbury@gmail.com>
wrote:

> Hi,
>
> I am running emacs-mac-app (v. 25.3.1) installed from Mac Ports, with
> org-mode version 9.1.6, on Mac OS 10.13.3.
>
> I have set up org-protocol.  If I open a terminal emulator window and
> enter this command
>
> emacsclient -n "org-protocol:/capture?url=http%3a%2f%2fduckduckgo%2ecom&
> title=DuckDuckGo"
>
> org-protocol works.  I can select the template I want, and an entry gets
> added to my .org file.
>
> However, if I add in a template specification
>
> emacsclient -n "org-protocol:/capture?template=t?url=http%3a%2f%
> 2fduckduckgo%2ecom&title=DuckDuckGo"
>
> I get this error:
>
> *ERROR*: No capture template referred to by "t?url" keys
>
> It seems the list isn't getting split at the '?' after 'template=t'.  I
> haven't been able to find anything on this and appear to be doing what
> org-protocol.el says I should.
>
> Any help would be appreciated.
>
> Thanks,
> Matt
>