docs: def raw(self, command, required_shell):
          '''Append a raw command to the scrim. This text will be appeneded to
          the output of :meth:`scrim.to_string` verbatim. Use required_shell to
          specify the shell which this raw command is applicable to.
  
          Examples:
              >>> scrim = Scrim()
              >>> scrim.raw('cat text.txt', 'bash')
              >>> scrim.raw('type text.txt', 'cmd.exe')
              >>> scrim.raw('Get-Content text.txt', 'powershell.exe')
              >>> scrim.to_bash()
              'cat text.txt'
              >>> scrim.to_cmd()
              'type text.txt'
              >>> scrim.to_powershell()
              'Get-Content text.txt'
          '''
  
          if not isinstance(command, basestring):
              raise TypeError(f('{command} must be a string'))
  
          if required_shell not in SHELLS:
              raise ValueError(f('{required_shell} must be one of {SHELLS}'))
  
          self.commands.append(RawCommand(command, required_shell))