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At least in Ubuntu it doesn't do anything at all.

# gunzip -d master.zip gunzip: master.zip: unknown suffix -- ignored

It's a ZIP file, so you'll want to use unzip, not gunzip.

Ubuntu's version of g(un)zip actually does tolerate ZIP inputs though; for that usage, just omit the '-d'.

Per the docs (I linked them in another comment), the correct command is `gunzip <foo.zip` or `gunzip -S .zip foo.zip`.