prune

SYNOPSIS
       prune [ -n node ] [ -N attrspec ] [ 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 gpr(1).  prune correctly handles cycles, loops and multi-edges.

       Both  options  can  appear multiple times on the command line. All sub-
       graphs 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.


EXAMPLES
       An input graph test.dot of the form

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

              B -> D;
              B -> E;
            }

       , processed by the command

            prune -n B test.dot

       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.dot of the form

            digraph DG {

       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), gpr(1)


AUTHOR
       Marcus Harnisch <marcus.harnisch@gmx.net>



                                                                      prune(1)