I am not sure about cmd.exe, but for *nix shells, it is not possible. The backslash is interpreted by the shell running the prompt, which means the script gets the string without the backslash.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: [SHELL] Detect backslash in command line args by choroba
in thread [SHELL] Detect backslash in command line args by syphilis

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