How to find name of command in order to use the utility

One tactic would be to investigate what files the package installed into the various bin directories. For instance, on a dpkg-based distribution, you might do something like:

dpkg -L postgresql-client-9.3 | grep bin

or on a system using RPMs you might do something like:

dnf repoquery -l PACKAGE_NAME | grep bin

and then read the manual pages for the binaries you find. A challenges of this tactic is that in some cases (such as postgresql) the files are spread out over a few packages.