Grep list only unique filenames
To list unique filenames using grep, do the following:
grep -irl "search-term" .
Notice the ‘l’ flag, short for –files-with-matches, defined as “Suppress normal output; instead print the name of each input file from which output would normally have been printed. The scanning will stop on the first match.”
The i flag just makes the search case-insensitive, and r is recursive.