unzip -l

unzip -l zip_file.zip
unzip -l not_zip_file.zip
Archive:  not_zip_file.zip
 End-of-central-directory signature not found.  Either this file is not
 a zipfile, or it constitutes one disk of a multi-part archive.  In the
 latter case the central directory and zipfile comment will be found on
 the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of not_zip_file.zip or
       not_zip_file.zip.zip, and cannot find not_zip_file.zip.ZIP, period.

unzip, unzip --help