I dunno if you can find this out from the console, but I think the first two characters of a .zip file are always "PK"...

We would need 'file' command and corresponding /etc/magic file. Handy to have anyway... Extracting first two bytes of every file with dd would be much slower.

Dragi "Bonzi" Raos
Zagreb, Croatia
Q#5196, MkII#80000376, 18GB green
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue