sudo -u postgres

sudo -u postgres psql

sudo -u postgres -- bash -c "psql -c 'CREATE database tsdb'"
sudo -u postgres -- bash -c "psql tsdb -c 'CREATE EXTENSION IF NOT EXISTS timescaledb;'"

EOF

psql -c

PostgreSQL: psql, .psqlrc, .pgpass, $HOME/.pg service.conf, -U, -W, -d, meta-commands: \du, \dg, \ddp, \dp, \list, \dn, \dt, \c, \l, \di, \q, show users, show, su - postgres, psql -c, \?, \connect, --version, --help, PL/pgSQL