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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 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 for correctly switching or renaming these.

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

       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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