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+.TH ACYCLIC 1 "21 March 2001"
+.SH NAME
+acyclic \- make directed graph acyclic
+.SH SYNOPSIS
+.B acyclic
+[
+.B \-nv?
+] [
+.B \-o
+.I outfile
+]
+[ 
+.I file
+]
+.SH DESCRIPTION
+.B acyclic
+is a filter that takes a directed graph as input and outputs
+a copy of the graph with sufficient edges reversed to make
+the graph acyclic. The reversed edge inherits all of the attributes
+of the original edge. The optional file argument specifies where the
+the input graph is stored; by default, the program reads from \fBstdin\fP.
+.SH OPTIONS
+The following options are supported:
+.TP
+.B \-n
+No output is produced, though the return value
+will indicate whether the graph is acyclic or not.
+.TP
+.B \-v
+Print information about whether the file is acyclic, has a cycle or
+is undirected.
+.TP
+.BI \-o " outfile"
+causes the output to be written to the specified file; by default,
+output is written to \fBstdout\fP.
+.TP
+.B \-?
+option causes the program to print usage information.
+.SH RETURN CODES
+.B acyclic
+returns
+.B 0
+if the graph is acyclic;
+.B 1
+if the graph has a cycle;
+.B 2
+if the graph is undirected; and
+.B 255
+if there are any errors.
+.SH BUGS
+If the graph is strict and there is a cycle of length 2, 
+the attributes of the reversed edge are lost.
+.PP
+Some edge attributes are non-symmetric, referring to either the head
+or tail node. At present, there is no mechanism or convention for
+for correctly switching or renaming these.
+.SH AUTHORS
+Stephen C. North <north@research.att.com>
+.br
+Emden R. Gansner <erg@research.att.com>
+.SH "SEE ALSO"
+gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), libgraph(3)