tred1

Usage

Overview

tred computes the transitive reduction of directed graphs, and prints the resulting graphs to a file or standard output. This removes edges implied by transitivity. Nodes and subgraphs are not otherwise affected. The ``meaning'' and validity of the reduced graphs is application dependent. tred is particularly useful as a preprocessor to dot to reduce clutter in dense layouts.

Undirected graphs are silently ignored.

Options

The following options are supported:

-o FILE

Redirect output to the given file. By default, output goes to stdout.

-v

Verbose output to stderr.

-r

Print information of removed edges to stderr.

-?

Print usage information.

Operands

The following operand is supported:

files

Names of files containing 1 or more graphs in dot format. If no files operand is specified, the standard input will be used.

Diagnostics

If a graph has cycles, its transitive reduction is not uniquely defined. In this case tred emits a warning.