Most of the time, though, you may be using only a few of those options, as in:
user=myuser password=mypwd dbname=mydb
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The above file has parameters "user" (Postgres user), "password" (the password for Postgres user), "dbname" (the Postgres database name). If you use peer-authenticated (i.e. passwordless) login, then omit "password" - this is when the Postgres user name is the same as your Operating System user name and where local unix domain socket is used for authentication.
