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ACYCLIC(1)									       ACYCLIC(1)

       acyclic - make directed graph acyclic

       acyclic [ -nv?  ] [ -o outfile ] [ file ]

       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 stdin.

       The following options are supported:

       -n     No output is produced, though the return value will indicate whether the	graph  is
	      acyclic or not.

       -v     Print information about whether the file is acyclic, has a cycle or is undirected.

       -o outfile
	      causes  the output to be written to the specified file; by default, output is writ-
	      ten to stdout.

       -?     option causes the program to print usage information.

       acyclic returns 0 if the graph is acyclic; 1 if the graph has a cycle; 2 if the	graph  is
       undirected; and 255 if there are any errors.

       If  the	graph  is strict and there is a cycle of length 2, the attributes of the reversed
       edge are lost.

       Some edge attributes are non-symmetric, referring to either the	head  or  tail	node.  At
       present, there is no mechanism or convention for correctly switching or renaming these.

       Stephen C. North <north@research.att.com>
       Emden R. Gansner <erg@research.att.com>

       gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), libgraph(3)

					  21 March 2001 			       ACYCLIC(1)
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