How to delete postgresql database on linux - linux

Question

I am trying to learn postgresql on linux using the command line interface.
I have added some databases a while back, following some tutorials (which I have since forgot everything I have learned).
Now I want to delete these databases.
I made the assumption that I should be doing this by using psql, the command-line interface to postgresql.
You can see what I have tried in the following command line output, and that none of it has succeeded.
psql (9.5.6)
Type "help" for help.
postgres=# \list
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
postgres | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
template0 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
testdb | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
(4 rows)
postgres=# dropdb template1
postgres-# \list
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
postgres | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
template0 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
testdb | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
(4 rows)
postgres-# DROP DATABASE template1
postgres-# \list
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
postgres | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
template0 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
testdb | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
(4 rows)

Answer 1

Yes,
DROP DATABASE template1;
And dont forget to backup your database:
to backup: pg_dump name_of_database > name_of_backup_file.bak
to restore: psql empty_database < backup_file.bak

Answer 2

Make sure and end your SQL commands with a semicolon (;)
Try issuing the command
DROP DATABASE template1;
with the semicolon on the end.

Answer 3

If your database contains 'template1' and 'template0' db name. You can use my script below:
UPDATE pg_database SET datistemplate='false' WHERE datname='template1';
DROP DATABASE template1;