Re: Confusion between psql options and pg_service file config

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/15/libpq-connect.html
Description:

I feel like I'm going in circles trying to square `psql` options (15: psql)
with connection service file parameters (15: 34.17).  I've lost exactly
which page I started on, but it was something like this...

- I start at https://www.postgresql.org/docs/15/app-psql.html
  - Under "Options"
    -c _command_ shows that I can run an arbitrary command on connection.
Great!

- But I'd like to specify something similar in the pg_service file, so I
look up I look up the Connection Service File, section 34.17 -
https://www.postgresql.org/docs/15/libpq-pgservice.html

  - So far, so good. The "parameters are connection parameters; see [Section
34.1.2](https://www.postgresql.org/docs/15/libpq-connect.html#LIBPQ-PARAMKEYWORDS)
for a list."
    - Following that link, I scroll down to the key word "options" which
"Specifies command line options" presumably like those for psql.

What I have found particularly confusing is some of the keywords for the
pg_service file clearly duplicate the options for `psql` but some of them
are equivalent, but not identical keywords (eg, `psql --username` vs
pg_service.conf keyword 'user').  Are both valid, or are they restricted to
their respective realm?  (That's a question I'm asking the documentation to
answer, not a question I'm directly asking you.)

There is also no particularly clear connection between psql options and the
connection service file; it's even hard to find where the app-psql.html page
indicates that using a service name in conjunction with a connection service
file can make invoking psql so much easier  :- )

Additionally, since the concepts are so similar to each other,