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From: Tim Lewis <tim.lewis@insyde.com>
To: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>
Thread-Topic: [shell] @ does not work before if, endif, for and many other
 command.
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Date: Fri, 2 Dec 2016 14:20:34 +0000
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Try this:

:start
                @if %1 =3D=3D ""  then
                  @goto Done
                @endif
  @echo Parameter: %1
  @shift
  goto start
:Done

Per Chapter 4

Also, additional '@' before a command in a script file can prevent the curr=
ent command from being echoed.