Commands often used

Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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# 27.6. Commands often used

The commands listed below are some that we use often, but many more exist. Check the man page for more details and information. To define a new user in your database, run the createuser utility program:

                     [root@deep] /# su postgres
                     [postgres@deep /]$ createuser

                     Enter name of user to add ---> admin
                     Enter user's postgres ID or RETURN to use unix user ID: 500 ->
                     Is user "admin" allowed to create databases (y/n) y
                     Is user "admin" a superuser? (y/n) y
                     createuser: admin was successfully added

To remove a user in your database, run the destroyuser utility program:

                     [root@deep] /# su postgres
                     [postgres@deep /]$ destroyuser

                     Enter name of user to delete ---> admin
                     destroyuser: delete of user admin was successful.

To create a new database, run the createdb utility program:

                     [root@deep] /# su postgres
                     [postgres@deep /]$ createdb dbname

  dbname is the name of the database.

or with the Postgres terminal monitor program (psql)

                     [root@deep] /# su admin
                     [admin@deep /]$ psql template1

                     Welcome to the POSTGRESQL interactive sql monitor:
                     Please read the file COPYRIGHT for copyright terms of POSTGRESQL
                     [PostgreSQL 6.5.3 on i686-pc-linux-gnu, compiled by egcs ]

                     type \? for help on slash commands
                     type \q to quit
                     type \g or terminate with semicolon to execute query
                     You are currently connected to the database: template1

                     template1-> create database foo;
                     CREATEDB

> : Client connections can be restricted by IP address and/or user name via the `pg_hba.conf` file in `PG_DATA`.

Other useful Postgres terminal monitor program commands (psql) are: To connect to the new database, use the command:

                     template1-> \c foo

connecting to new database: foo

                     foo->

To create a table, use the command:

                     foo-> create table bar (i int4, c char(16));
                     CREATE
                     foo->

To inspect the new table, use the command:

                     foo-> \d bar

                     foo->

                     Table    = bar
                     +----------------------------------+----------------------------------+------------+
                     |              Field	|          Type	        |                          Length  |
                     +----------------------------------+----------------------------------+------------+
                     | I	                | int4	                |                                4 |
                     | c	                | char()	        |                               16 |
                     +----------------------------------+----------------------------------+------------+

To drop a table, index, view, use the command:

                     foo-> drop table table_name;
                     foo-> drop index index_name;
                     foo-> drop view view_name;

To insert into: once a table is created, it can be filled using the command.

                     foo-> insert into table_name (name_of_attr1, name_of_attr2, name_of_attr3)
                     foo-> values (value1, value2, value3);

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