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prune(1)


NAME

   prune - Prune directed graphs

SYNOPSIS

   prune [ -n node ] [ -N attrspec ] [ -v ] [ -(h|?)  ] [ files ...  ]

DESCRIPTION

   prune  reads  directed  graphs  in  the  same format used by dot(1) and
   removes subgraphs rooted at nodes specified on  the  command  line  via
   options.  These  nodes themselves will not be removed, but can be given
   attributes so that they can be easily located by a graph stream  editor
   such  as  gvpr(1).   prune  correctly  handles cycles, loops and multi
   edges.

   Both options can  appear  multiple  times  on  the  command  line.  All
   subgraphs  rooted at the respective nodes given will then be processed.
   If a node does not exist, prune  will  skip  it  and  print  a  warning
   message  to  stderr.   If  multiple  attributes are given, they will be
   applied to all nodes that have been processed.  prune writes the result
   to the stdout.

OPTIONS

   -n name
          Specifies name of node to prune.

   -N attrspec
          Specifies  attribute  that will be set (or changed if it exists)
          for  any  pruned  node.   attrspec  is  a  string  of  the  form
          attr=value.

   -v     Verbose output.

   -h -?  Prints the usage and exits.

EXAMPLES

   An input graph test.gv of the form

        digraph DG {
          A -> B;
          A -> C;

          B -> D;
          B -> E;
        }

   , processed by the command

        prune -n B test.gv

   would  produce the following output (the actual code might be formatted
   in a slightly different way).

        digraph DG {
          A -> B;
          A -> C;
        }

   Another input graph test.gv of the form

        digraph DG {
          A -> B;
          A -> C;

          B -> D;
          B -> E;

          C -> E;
        }

   (note the additional edge from C to E ), processed by the command

        prune -n B -N color=red test.gv

   results in

        digraph DG {
          B [color=red];
          A -> B;
          A -> C;
          C -> E;
        }

   Node E has not been removed since its second  parent  C  is  not  being
   pruned.

EXIT STATUS

   prune  returns  0  on  successful completion.  It returns 1 if an error
   occurs.

SEE ALSO

   dot(1), gvpr(1)

AUTHOR

   Marcus Harnisch <marcus.harnisch@gmx.net>

                                                                  prune(1)



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