/usr/share/hyphy/UserAddins/BatchFileByURL is in hyphy-common 2.2.6+dfsg-3build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 | fprintf (stdout, "\nHTTP URL:");
fscanf  (stdin,  "String", theURL);
GetURL  (inCode,theURL);
ExecuteCommands (inCode);
inCode = 0;
					  
 |