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       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 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)