The "MATE Search Tool" comes close.
It can:
Select a starting directory.
Search for a specific extension.
Search for a keyword in file content.
It cannot:
Search ONLY the specified directory.
Return files that DO NOT contain a keyword.
I suspect what I want would most likely be what I'm looking for.
"ls" can search by extension and stay in specified directory.
It cannot include/exclude keywords.
My immediate problem involves only a couple dozen files so manual search
is feasible.
Suggestions?
TIA