igrep(1) on Linux
The text 6b4780c37f1a, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
search images for matching metadata
Flags it lists
-
--help -
-E -
-a -
-d -
-f -
-i -
-l -
-r -
-v