[$] Program names and "pollution"

A Linux user's $PATH likely contains well over a thousand different
commands that were installed by various packages. It's not immediately
obvious which package is responsible for a command with
a generic name, like createuser. There are ways to figure it out, of
course, but perhaps it would make sense for packages like PostgreSQL, which
is responsible for createuser, to give their commands names that
are less generic—and more easily disambiguated—such as
pg_createuser. But renaming commands down the road has 'backward
compatibility problems'
written all over it, as a recent discussion on the pgsql-hackers mailing
list shows.