CentOS 7.0 - man page for prune (centos section 1)

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prune(1)										 prune(1)

       prune - Prune directed graphs

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

       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.

       -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.

       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  dif-
       ferent 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.

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

       dot(1), gvpr(1)

       Marcus Harnisch <marcus.harnisch@gmx.net>


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