From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Gauland <mikelygee@gmail.com>
Subject: Re: [org-babel] String interpolation using shell
Date: Fri, 10 Jan 2020 09:31:18 +1300
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On 10/01/2020 5:56 am, sergio ruiz wrote:
> #+BEGIN_SRC shell :var url_input=url_name
>   curl url_input
> #+END_SRC
>
> #+RESULTS:
>
> ^^ This doesn't work. It is trying to use "url_input" in the curl command.
>
You need  a $ in front of the name when referencing a variable in the shell:

#+BEGIN_SRC shell :var url_input=url_name
   curl $url_input
#+END_SRC