Qual é a diferença entre os redirecionamentos seguintes: <<< e <<, >>> e >> ? [RESOLVIDO]

echo "Hello World !" > notas.txt 

echo "Hello World !" >> notas.txt 

tr a-z A-Z <<< 'here strings' 

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Não existe saber mais ou saber menos, existem saberes diferentes.

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   Here Strings

       A variant of here documents, the format is:



              <<<word



       The  word  undergoes  brace  expansion,  tilde expansion, parameter and

       variable expansion, command  substitution,  arithmetic  expansion,  and

       quote  removal.   Pathname  expansion  and  word splitting are not per-

       formed.  The result is supplied as a single string to  the  command  on

       its standard input. 

   Here Strings

       A variant of here documents, the format is:



              <<<word



       The  word  undergoes  brace  expansion,  tilde expansion, parameter and

       variable expansion, command  substitution,  arithmetic  expansion,  and

       quote  removal.   Pathname  expansion  and  word splitting are not per-

       formed.  The result is supplied as a single string to  the  command  on

       its standard input. 

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>>> def opposite(word):

...     n = len(word) - 1

...     while n >= 0:

...             print(word[n], end="")

...             n -= 1

...     print()

... 

>>> opposite('socorram me subi no onibus em marrocos')

socorram me subino on ibus em marrocos

>>> õ_Ô

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