@vitor thanks for response,
I want Alfred to search some file for me without any user interaction window in a workflow, the input is a list of file name (of course can process them one by one in a loop), the output is full path of the file in my computer. Actually it is identical to what "find" command does (filename -> full path), but Alfred is super fast if I search a file in the search bar.
File Filter does the task actually, I can input a file name to it from workflow, but it has a popup window even the file name is unique in the computer. As I mentioned, I want to process a list of file name, it's terrible to get popup window for each file. So what I want is a no popup window solution, just outputs the file path as string to the following processing steps. Thanks.