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The psql program uses command-line options and parameters to control its features The format of the psql command line is
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psql [options] [databasename [username] ]
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where options can be one or more options that define additional information that controls the various psql features The databasename and username parameters allow you to directly specify these values on the command line without having to use the options format To simply start psql and connect to a specific database on the local system as a specific user, all you need to do is list the database name and user account name on
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The psql Program
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the command line As was demonstrated in 4, you can connect to the database named test on the local system using the PostgreSQL user account fred with the psql command:
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psql test fred
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The PostgreSQL pg_hbaconf configuration file on the server defines what authentication method the psql connection needs to use to authenticate the connection (see 3) If the entry in the pg_hbaconf file defining this connection requires password authentication, psql asks you for the password for the fred account Once you enter the correct password, the psql command prompt appears, ready for action You may have also noticed the psql link available in the PostgreSQL 82 Start menu This link provides a quick way to start psql as the postgres superuser account and connect to the postgres database This link is handy if you need to do any quick database administration work, but I would not recommend using it for normal database activity It is always easy to enter wrong commands, and always logging in as the superuser account can cause problems if you do the wrong things, such as accidentally delete the wrong database It is much safer to just log in as a normal user account unless you absolutely have to be the superuser
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The psql command-line options allows you to control what features are enabled when you start psql The format for a feature option is
optionname [value]
The value parameter is required for some options to further define the option behavior, such as specifying a filename or a variable name There are two formats that can be used to specify the optionname parameter: Long-name format Uses a common name to represent the option, preceded by a double dash, such as echo-queries Short-name format Uses a single character to represent the option, preceded by just a single dash, such as -e Be careful when using the short-name options, as they are case sensitive Table 5-1 describes all of the feature options that are available on the psql command line You can see from this table that many of the psql command-line options focus on controlling how table data is displayed You will see later in this chapter in the The psql Meta-commands section that many of these command-line options can also be set using psql meta-commands at the psql prompt Sometimes it is easier to include a quick command-line option than to use the internal meta-commands For example, if you just
PostgreSQL 8 for Windows
Short Name -a
Long Name echo-all
Description Displays all SQL lines processed from a script file in the output Sets output format to unaligned mode Data is not displayed as a formatted table Executes the single SQL statement statement and exits Specifies the database to connect to Echoes all queries to the screen Echoes hidden psql metacommands to the screen Executes SQL commands from file filename and exits Specifies the character to use to separate column data when in unaligned mode The default is a comma Specifies the IP address or hostname to connect to Generates HTML code for all table output Displays a list of available databases on the server and exits Redirects query output to the file filename Specifies the PostgreSQL server TCP port to connect to Sets the table printing option variable to value
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