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(Universal Resource Locator) This is an address, or tag which provides a way to identify and distinguish between which internet resource is needed. The beginning of the address indicates the type of resource: http: for Web pages, ftp: for file transfers or mailto: for e-mail addresses.
Handling command line arguments
Python scripts are fantastic tools for any OS, Mark Pilgrim shows how one can use command line arguments to make them even more versatile!
Postgresql in Ubuntu
Hold on: PostgreSQL does make use of Structured Query Language, but there is a lot more going on with PostgreSQL than with MySQL. Even setting it up can be a challenge. This is a great step by step tutorial that would be a great place to start setting up PostgreSQL in Ubuntu.
Options to use with 'Find'
Find can be a great way to locate what you are seeking, this page lays out what some of the options are.