https://www.postgresql.org/docs/current/app-psql.html
psql
.psqlrc, .pgpass
$HOME/.pg service.conf
-U, -W, -d
\du, \dg, \ddp, \dp, \list, \dn, \dt, \c, \l, \di, \q
show users
show
su - postgres
psql -c, \?, \connect, \conninfo
--version, --help
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