---
name: "yyextract"
section: "1"
platform: "linux"
package: "cutils"
version: "1.6-7"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/yyextract"
---

# yyextract(1)

extract grammar rules from a yacc grammar

## NAME

**yyextract** – extract grammar rules from a yacc grammar

## SYNOPSIS

**yyextract** \[**-behyV**\] \[**-o** *file*\] \[**-t** *title*\] \[**-w** *cols*\] \[*file ...*\]

## DESCRIPTION

The **yyextract** utility extracts the grammar rules from a yacc grammar.

The options are as follows:

- **-b**

  Select the Backus-Naur Form (BNF) for the output.

- **-e**

  Select the Extended Backus-Naur Form (EBNF) for the output.

- **-h**

  Output in HTML format.

- **-o** *file*

  Set the output destination to *file*.

- **-t** *title*

  Specify the page title for the generated HTML page.

- **-w** *cols*

  Set the width limit of the output (this sets only the width of the %token header).

- **-y**

  Select the yacc format for the output. This is the default format.

- **-V**

  Print version information on standard output then exit.

## NOTES

The Extended Backus-Naur Form (EBNF) is like the Backus-Naur Form (BNF) but with the empty rules translated with the zero-or-one operator (within the brackets '\[' and '\]').

## AUTHORS

Sandro Sigala \<sandro@sigala.it\>