[TriLUG] Strangeness in the Zip-world

[brian mullan via TriLUG]

you can check all of these to see if any help ID the problem or fix it:

   - Re-download the zip archive from the source.  Re-downloading the zip
   archive often fixes the problem if the original download was interrupted or
   corrupted somehow
   - Use a different download method for the zip file such as curl etc
   - Attempt to repair the zip archive at the command line with the
   following syntax, replacing file names as needed:

*zip -FF problem.zip --out repaired.zip | unzip*



   - If the archive file is multiple parts, make sure all of the zip files
   are contained within the same directory
   - *Verify the zip file* with sha1
   <http://osxdaily.com/2012/02/05/check-sha1-checksum-in-mac-os-x/> or md5
   <http://osxdaily.com/2009/10/13/check-md5-hash-on-your-mac/> if
   possible, this can tell you if the file has been corrupted or modified
   somehow compared to what you intended to download