code: def init_command(self, action, flags=None):
      '''return the initial Singularity command with any added flags.
          
         Parameters
         ==========
         action: the main action to perform (e.g., build)
         flags: one or more additional flags (e.g, volumes) 
                not implemented yet.
      '''
  
      if not isinstance(action, list):
          action = [action]      
      cmd = ['singularity'] + action
  
      if self.quiet is True:
          cmd.insert(1, '--quiet')
      if self.debug is True:
          cmd.insert(1, '--debug')
  
      return cmf init_command(self, action, flags=None):
      '''return the initial Singularity command with any added flags.
          
         Parameters
         ==========
         action: the main action to perform (e.g., build)
         flags: one or more additional flags (e.g, volumes) 
                not implemented yet.
      '''
  
      if not isinstance(action, list):
          action = [action]      
      cmd = ['singularity'] + action
  
      if self.quiet is True:
          cmd.insert(1, '--quiet')
      if self.debug is True:
          cmd.insert(1, '--debug')
  
      return cmd
docs: return the initial Singularity command with any added flags.
          
         Parameters
         ==========
         action: the main action to perform (e.g., build)
         flags: one or more additional flags (e.g, volumes) 
                not implemented yet.