vacuumdb has a fatal after database rename

Hi friends,

If I rename the database postgres before vacuumdb , the vacuumdb say
FATAL: database "postgres" does not exist.

[postgres(at)vdedu1 ~]$ vacuumdb -a
vacuumdb: vacuuming database "mydb"
vacuumdb: vacuuming database "postgres"
vacuumdb: vacuuming database "template1"
[postgres(at)vdedu1 ~]$ psql -c"alter database postgres rename to postgresql;"
ERROR: current database cannot be renamed
STATEMENT: alter database postgres rename to postgresql;
ERROR: current database cannot be renamed
[postgres(at)vdedu1 ~]$ psql
psql (9.5.4)
Type "help" for help.

postgres=# alter database postgres rename to postgresql;
ERROR: current database cannot be renamed
STATEMENT: alter database postgres rename to postgresql;
ERROR: current database cannot be renamed
postgres=# \q
[postgres(at)vdedu1 ~]$ psql -d template1 -c"alter database postgres rename
to postgresql;"
ALTER DATABASE
[postgres(at)vdedu1 ~]$ psql -l
FATAL: database "postgres" does not exist
psql: FATAL: database "postgres" does not exist
[postgres(at)vdedu1 ~]$ psql -l -d template1
List of databases
Name | Owner | Encoding | Collate | Ctype | Access
privile
ges
------------+----------+----------+-------------+-------------+-----------------
------
mydb | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
postgresql | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
=c/postgres
+
| | | | |
postgres=CTc/pos
tgres
template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
=c/postgres
+
| | | | |
postgres=CTc/pos
tgres
(4 rows)

[postgres(at)vdedu1 ~]$ vacuumdb -a
FATAL: database "postgres" does not exist
vacuumdb: vacuuming database "mydb"
vacuumdb: vacuuming database "postgresql"
vacuumdb: vacuuming database "template1"
[postgres(at)vdedu1 ~]$

2016-09-28
TT