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object --+    
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ActionHook --+
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            PreActionHook
Class representing a pre-action hook associated with an action.
A hook associated with an action is a shell command to be executed either before or after a named action is executed. In this case, a pre-action hook is executed before the named action.
The following restrictions exist on data in this class:
The internal before instance variable is always set to 
  True in this class.
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 Constructor for the  
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 Official string representation for class instance. 
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