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From Odwiki

HScript CookBook

Here is a list of some common operations done in HScript which you might find useful.

Traversing nodes

• Recursive script to loop through all nodes in a given tree:

# this is a file called recurse.cmd
#
if( `ishvariable("RECURSING")` == 0 )
  # this section of code is called the first time this script is executed
  #
  set saved_path = `execute("oppwf")`
  echo "starting recursion at $arg1
  cd $arg1
  set -g RECURSING = 1
  source recurse.cmd
  set -u RECURSING
  opcf $saved_path
else
  #  this section of code gets called for every node
  #
  set nodes = `execute("opls -a")`
  foreach node ($nodes)
    if( `opnchildren("$node")` > 0 )
      echo "diving down into network: $node"
      cd $node
      source recurse.cmd
      cd ..
    else
      # here is where you process the node
      #
      echo --processing $node
      #
    endif
  end
endif 

• Very simple script to loop through all nodes in a given tree using opfind:

set allnodes = (`execute("opfind -p $arg1")`)
foreach node ($allnodes)
  echo process the node $node here
end

Manipulating OTLs

• Find out which OTL a certain operator in a scene is from: ($arg is the requested node, output in $otl)

set optype = `execute("optype -o $arg1")`
set otl = `execute("otgetotl $optype")`