prune(1) General Commands Manual 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 re-
moves subgraphs rooted at nodes specified on the command line via op-
tions. These nodes themselves will not be removed, but can be given at-
tributes 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 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.
-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 oc-
curs.
SEE ALSO
dot(1), gvpr(1)
AUTHOR
Marcus Harnisch <marcus.harnisch@gmx.net>
prune(1)
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