erb(1) on macOS
The text de971dcaed99, as macOS 10.13.5, macOS 10.13.4, macOS 10.13.3, macOS 10.13.2, macOS 10.13.1, macOS 10.13 shipped it.
Ruby Templating
Flags it lists
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--debug -
--encoding -
--help -
--version -
-E -
-P -
-S -
-T -
-U -
-d -
-h -
-n -
-v -
-x