grep(1) on OpenBSD
The text 55fbf87f48b0, as OpenBSD 3.3 shipped it.
print lines matching a pattern
Flags it lists
-
-E -
-F -
-H -
-L -
-P -
-R -
-X -
-a -
-b -
-c -
-e -
-f -
-h -
-i -
-l -
-n -
-q -
-s -
-v -
-w -
-x -
-z