uniq(1) on Linux
The text bdca60110e23, as Debian 9 (Stretch) shipped it.
report or omit repeated lines
Flags it lists
-
--all-repeated -
--check-chars -
--count -
--group -
--help -
--ignore-case -
--repeated -
--skip-chars -
--skip-fields -
--unique -
--version -
--zero-terminated -
-D -
-c -
-d -
-f -
-i -
-s -
-u -
-w -
-z