csplain(1) on Linux
The text 18e0a1854eab, as Debian 10 (Buster) shipped it.
PDF output from TeX
Flags it lists
-
-draftmode -
-enc -
-etex -
-file-line-error -
-file-line-error-style -
-halt-on-error -
-help -
-ini -
-ipc -
-ipc-start -
-mltex -
-no-file-line-error -
-no-parse-first-line -
-no-shell-escape -
-parse-first-line -
-recorder -
-shell-escape -
-src-specials -
-version