---
name: "nauty-underlyingg"
section: "1"
platform: "linux"
package: "nauty"
version: "2.8.9+ds-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nauty-underlyingg"
---

# nauty-underlyingg(1)

take the underlying undirected graphs of a file of graphs

## NAME

nauty-underlyingg - take the underlying undirected graphs of a file of graphs

## SYNOPSIS

**underlyingg** \[*-q*\] \[*infile* \[*outfile*\]\]

## DESCRIPTION

-

  Take the underlying undirected graphs of a file of graphs.

-

  The output file has no header. Undirected graphs are passed through without change, while Underlying graphs of digraphs are written in sparse6 format.

- **-q**

  Suppress auxiliary information.