acyclic man page on Oracle

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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 origi‐
       nal 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 written 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 cor‐
       rectly switching or renaming these.

       Stephen C. North <>
       Emden R. Gansner <>

       gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), lib‐

				 21 March 2001			    ACYCLIC(1)

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