byacc(1) on Linux
The text f1bf2a03d75e, as Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
an LALR(1) parser generator
Flags it lists
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-V -
-b -
-d -
-g -
-l -
-o -
-p -
-r -
-t -
-v