rust-tr(1) on Linux
The text 1b0738cdbe47, as Debian 12 (Bookworm) shipped it.
manual page for tr 9.1
Flags it lists
-
--complement -
--delete -
--help -
--squeeze-repeats -
--truncate-set1 -
--version -
-C -
-c -
-d -
-s -
-t