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authorSven Eisenhauer <sven@sven-eisenhauer.net>2023-11-10 15:11:48 +0100
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+.TH TRED 1 "21 March 2001"
+.SH NAME
+tred \- transitive reduction filter for directed graphs
+.SH SYNOPSIS
+.B tred
+[
+.I files
+]
+.SH DESCRIPTION
+.B tred
+computes the transitive reduction of directed graphs,
+and prints the resulting graphs to 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.
+.B tred
+is particularly useful as a preprocessor to
+.I dot
+to reduce clutter in dense layouts.
+.PP
+Undirected graphs are silently ignored.
+.SH OPERANDS
+The following operand is supported:
+.TP 8
+.I files
+Names of files containing 1 or more graphs in dot format.
+If no
+.I files
+operand is specified,
+the standard input will be used.
+.SH "BUGS"
+Using bitmaps internally would substantially decrease running time.
+.SH "DIAGNOSTICS"
+If a graph has cycles, its transitive reduction is not uniquely defined.
+In this case \fItred\fP emits a warning.
+.SH AUTHORS
+Stephen C. North <north@research.att.com>
+.br
+Emden R. Gansner <erg@research.att.com>
+.SH "SEE ALSO"
+gc(1), dot(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), libgraph(3)