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Com a alteração deste comando, o timeout estava inócuo pois atuava sobre o echo e não sobre o bluetoothctl. De qualquer forma, na versão anterior, este timeout era inócuo também pois como estava num pipe, o código de saída era sempre do último comando executado.
Com esta alteração e com a linha set -o pipefail, o codigo de retorno de erro é de qualquer comando dentro do pipe.
Para testar isso, faça:
echo "show" | timeout 0.000000000001 sort <- retorna erro
echo "show" | timeout 0.000000000001 sort | ls <- retorna ok
usando set -o pipefail:
echo "show" | timeout 0.000000000001 sort | ls <- retorna erro