How to call a Posgresql function from the Putty terminal and see the result in the same place?

Question

PostgreSQL

just sql command is not working..

Answer 1

Open a connection, check that psql is starting.
And work in it.
But I recommend installing pgcli.com
right away PS: there is also pgAdmin 4, just open access to it from your DBMS.

Answer 2

psql -c "select now();"