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mac 10.15.4

brew update
brew install postgresql
psql --version
    psql (PostgreSQL) 12.3
initdb /usr/local/var/postgres -E utf8
   The files belonging to this database system will be owned by user "**".
   This user must also own the server process.
   he database cluster will be initialized with locale "ja_JP.UTF-8".
   initdb: could not find suitable text search configuration for locale "ja_JP.UTF-8"
   The default text search configuration will be set to "simple".
   Data page checksums are disabled.
   initdb: error: directory "/usr/local/var/postgres" exists but is not empty
   If you want to create a new database system, either remove or empty
   the directory "/usr/local/var/postgres" or run initdb
   with an argument other than "/usr/local/var/postgres".
brew services start postgresql
psql -l
createuser -d -r username