In Oracle Database 12c release 2, you can run the Parallel Upgrade Utility using command-line batch scripts.catupgrd.sql is no longer distributed.

Starting in Oracle Database 12c release 2 (12.2), you can run the Parallel Upgrade Utility (catctl.pl) from the command line by entering the shell commands dbupgrade for Linux and UNIX, and dbupgrade.com for Windows. These shell scripts call the catctl.pl script from the upgrade binary home. You can either run these scripts with default values, or you can run them with the same input parameters that you use to run catctl.pl from the Perl prompt.