10-11-2017
I tried, but I didn't understand.
I tried, for example, ps -e, then ps -ed and the list was shorter than the first. So I thought it was depending on the d parameter, more restrictive, but I tried ps -d and the list was shorter again, so the -d parameter alone was more restrictive...
I tried other combinations, but had the same, confusing, results...
Last edited by rbatte1; 10-12-2017 at 10:11 AM..
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DROPDB(1) PostgreSQL Client Applications DROPDB(1)
NAME
dropdb - remove a PostgreSQL database
SYNOPSIS
dropdb [ option... ] dbname
DESCRIPTION
dropdb destroys an existing PostgreSQL database. The user who executes this command must be a database superuser or the owner of the data-
base.
dropdb is a wrapper around the SQL command DROP DATABASE [drop_database(7)]. There is no effective difference between dropping databases
via this utility and via other methods for accessing the server.
OPTIONS
dropdb accepts the following command-line arguments:
dbname Specifies the name of the database to be removed.
-e
--echo Echo the commands that dropdb generates and sends to the server.
-i
--interactive
Issues a verification prompt before doing anything destructive.
dropdb also accepts the following command-line arguments for connection parameters:
-h host
--host host
Specifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory
for the Unix domain socket.
-p port
--port port
Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
-U username
--username username
User name to connect as.
-w
--no-password
Never issue a password prompt. If the server requires password authentication and a password is not available by other means such as
a .pgpass file, the connection attempt will fail. This option can be useful in batch jobs and scripts where no user is present to
enter a password.
-W
--password
Force dropdb to prompt for a password before connecting to a database.
This option is never essential, since dropdb will automatically prompt for a password if the server demands password authentication.
However, dropdb will waste a connection attempt finding out that the server wants a password. In some cases it is worth typing -W
to avoid the extra connection attempt.
ENVIRONMENT
PGHOST
PGPORT
PGUSER Default connection parameters
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see in the documentation).
DIAGNOSTICS
In case of difficulty, see DROP DATABASE [drop_database(7)] and psql(1) for discussions of potential problems and error messages. The
database server must be running at the targeted host. Also, any default connection settings and environment variables used by the libpq
front-end library will apply.
EXAMPLES
To destroy the database demo on the default database server:
$ dropdb demo
To destroy the database demo using the server on host eden, port 5000, with verification and a peek at the underlying command:
$ dropdb -p 5000 -h eden -i -e demo
Database "demo" will be permanently deleted.
Are you sure? (y/n) y
DROP DATABASE demo;
SEE ALSO
createdb(1), DROP DATABASE [drop_database(7)]
Application 2010-05-14 DROPDB(1)