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DOS script launcher...

Similarly any '@' at the start of the line (outside of quotes) will also be
treated as comment. This allow you to create a DOS script launcher, to
allow a ".bat" DOS scripts to run as "magick" scripts instead.

  @echo This line is DOS executed but ignored by Magick
  @magick -script %~dpnx0 %*
  @echo This line is processed after the Magick script is finished
  @GOTO :EOF
  #
  # The rest of the file is magick script
  -read label:"This is a Magick Script!"
  -write show: -exit

But this can also be used as a shell script launcher as well!
Though is more restrictive and less free-form than using ':'.

    #!/bin/sh
    @() { exec magick -script "$@"; }
    @ "$0" "$@"; exit
    #
    # The rest of the file is magick script
    -read label:"This is a Magick Script!"
    -write show: -exit

Or even like this...

    #!/bin/sh
    @() { }
    @; exec magick -script "$0" "$@"; exit
    #
    # The rest of the file is magick script
    -read label:"This is a Magick Script!"
    -write show: -exit