postgresql-9.4 9.4.18-0+deb8u1 / usr / lib / postgresql / 9.4 / bin / postmaster

/usr/lib/postgresql/9.4/bin/postmaster is in postgresql-9.4 9.4.18-0+deb8u1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/postgresql/9.4/bin/postgres