---
name: "nauty-directg"
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-directg"
---

# nauty-directg(1)

generate small digraphs with given underlying graph

## NAME

nauty-directg - generate small digraphs with given underlying graph

## SYNOPSIS

**directg** \[*-q*\] \[*-u\|-T\|-G*\] \[*-V*\] \[*-o\|-a*\] \[*-f#*\] \[*-e#\|-e#:#*\] \[*-s#/#*\] \[*infile* \[*outfile*\]\]

## DESCRIPTION

-

  Read undirected graphs and orient their edges in all possible ways.

-

  Edges can be oriented in either or both directions (3 possibilities). Isomorphic directed graphs derived from the same input are suppressed. If the input graphs are non-isomorphic then the output graphs are also.

- **-e**# \| **-e**#:#

  specify a value or range of the total number of arcs

- **-o**

  orient each edge in only one direction, never both

- **-a**

  only make acyclic orientations (implies **-o**)

- **-f**#

  Use only the subgroup that fixes the first # vertices setwise

- **-T**

  use a simple text output format (nv ne edges) instead of digraph6

- **-G**

  like **-T** but includes group size as third item (if less than 10^10)

-

  The group size does not include exchange of isolated vertices.

- **-V**

  only output graphs with nontrivial groups (including exchange of

- isolated vertices).

  The **-f** option is respected.

- **-u**

  no output, just count them

- **-s**#/#

  Make only a fraction of the orientations: The first integer is

-

  the part number (first is 0) and the second is the number of parts. Splitting is done per input graph independently.

- **-q**

  suppress auxiliary information