[SaF] DOS program: Is it in this ZIP?

[bob . in . jersey]

I am looking for a simple DOS program that has two parameters, the
name of a ZIP (compressed) file, and the name of a file which might
be compressed within that ZIP file, that returns the truth about the
latter being contained within the former as the DOS variable
"errorlevel".

The thinking here is that if a file already exists within the ZIP of
the same name as a file I would have added to the ZIP, I could
discard the file rather than waste the time of adding it again.

TIA


--  
BOB