From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bosco <jbosco.gg@gmail.com>
Subject: Re: echo "\\1"?
Date: Thu, 27 Jul 2017 15:32:48 +0000
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To: Eric Blake <eblake@redhat.com>
Cc: dash@vger.kernel.org

Ahh, now I understood.
In command
  echo \\\\
first dash interprets the command line (and the arguments), then
internally echo interprets the arguments. But echo is part of dash, so
dash interprets twice the same argument. Sorry I didn't know that.

Thank you for your help and your time.
Bosco.