After downloading JDeveloper 12 for linux from https://edelivery.oracle.com we have two files in multipart (spanned) zip format, e.g. V779124-01_1of2.zip and V779124-01_2of2.zip .
The first fioile is exactly 2 GB, but cannot unzip using linux unzip.
>unzip V779124-01*.zip
Archive: V779124-01_1of2.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.
After some investigation I found out that the best workaround is to use jar in stead of unzip:
Create an empty directory and copy the zipfiles as the user that wiull do the installation
jar xvf V779124-01_1of2.zip
then extract the second zip in that same directory using unzip, jar or whatever tool