We can install wordpress in our domain in two ways . Either as main site ie in public_html or as an sub website inside a directory in the public_html..difference between then is just about uncompromising  the tar file in public_html directory or in a sub directory . For doing that in either way all the steps are same .

First we need to download the tar file and we need to uncompress it in the needed directory .

cd /<path-to-document-root>/public_html
wget http://wordpress.org/latest.tar.gz

now decompress the file

tar -xvzf  latest.tar.gz

change the privilage of the folder by

chmod -R 777 *

noramally to make it the main site we copy the tar file and extract the tar file in same public_html directroy so that it can be accessed like

http://your-domain-name

To make it a sub website first we need to make a direcotry with any name inside the public_html and untar the tar file into that it can be accessed by

http://your-domain-name/<name-we-give>

Second thing we need is a database which we can create through the cpanel or through the shell .when creating the databse user throug the cpanel we need to create a database first and later a user and we need to give full permission to that user over that database. All this can be done through

cpanel>>Home>>Mysql databse …Or

by following commands in the shell .To do it through shell we need to get into our server/vps through ssh and run the following command.Normally the databases will be named as username_databasename . And user of that database as username_name.

mysql
CREATE USER USER_NAME IDENTIFIED BY PASSWORD
CREATE DATABASE DATABASE_NAME;
GRAND ALL ON DATABASE_NAME TO USER_NAME;
FLUSH PRIVILEGES;
EXIT;

GRANT ALL PRIVILEGES ON db_base.* TO db_user @’%’ IDENTIFIED BY ‘db_passwd’;

Now go to browser and type “http://your-domain-name/” or “ http://your-domain-name/<name-we-give>” to get the auto install configuration file of the wordpress.There we will be asked for following and we need to fill in the needed details..Remember to give correct database name and user name leave the rest of options as it is

database: database_name
username:user_name
password:password
host:localhost:

and click next

If all things ends correctly it will be done and you will get the welcome page