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testing postgres connection in shell script
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DROPDB(1) PostgreSQL 9.2.7 Documentation DROPDB(1) NAME
dropdb - remove a PostgreSQL database SYNOPSIS
dropdb [connection-option...] [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 database. 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. -V, --version Print the dropdb version and exit. --if-exists Do not throw an error if the database does not exist. A notice is issued in this case. -?, --help Show help about dropdb command line arguments, and exit. 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. --maintenance-db=dbname Specifies the name of the database to connect to in order to drop the target database. If not specified, the postgres database will be used; if that does not exist (or is the database being dropped), template1 will be used. ENVIRONMENT
PGHOST, PGPORT, PGUSER Default connection parameters This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 31.14, "Environment Variables", 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)) PostgreSQL 9.2.7 2014-02-17 DROPDB(1)
