prerm is in php7.0-pgsql 7.0.33-0ubuntu0.16.04.2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
set -e
exit 0
|