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There are hardly two people more at odds than Richard Stallman and Bill Gates. A few anecdotes may help illustrate their different attitudes towards software and life in general. Here they are, the Harvard dropout and the MIT hacker, face to face: In 1975, Paul Allen and Bill Gates licensed a version of BASIC to the company MITS, for use with its newest creation, the Altair Computer. After seeing that computer sales were strong, but BASIC s were lagging, they discovered that many hobbyists from a club in Palo Alto were making illegal copies of the OS and installing it on their own. Bill Gates then wrote an infuriated letter in which he defended the right of software makers to earn profits by selling their products for a price. He asserted that widespread adoption of such software without proper payment would discourage developers from producing quality software. (Maybe if he opened the code to the hobbyists, the Altair BASIC would have improved from their collaboration!) In 1977, RMS was a programmer working at MIT s AI Laboratory. When the authorities tried to enforce password-protected access, Stallman convinced many users to set a blank password in order to re-enable anonymous access. He linked freedom to anonymity; today, he recommends not using a cellphone or a key card, so your movements cannot be tracked. In 1980, a new printer arrived at the AI Lab, and RMS requested access to its source code. He and some fellow hackers had successfully modified the code for the previous printer in order to enhance user experience. He was denied, and the printing with the new device was worse than with the previous one. That confirmed to him that people should have the right to access and modify the programs they use, in order to better them.

A data model provides us with information about how the data items in the database are interrelated. In this book, I will use an example of a golf club that has members who belong to teams and enter tournaments. One convenient way to give an overview of the different tables in a database is by using the class diagram notation from the Unified Modeling Language (UML).3 In this section, we will look at how to interpret a class diagram. A class is like a template for a set of things (or events, people, and so on) about which we want to keep similar data. For example, we might want to keep names and other details about the members of our golf club. Figure 1-1 shows the UML notation for a Member class. The name of the class is in the top panel, and the middle panel shows the attributes, or pieces of data, we want to keep about each member. Each member can have a value for LastName, FirstName, and so on.

Two questions Richard Stallman had to answer when laying the foundation for free software development were whether it should be licensed and, if so, how. There was a problem with the original idea of free software, a hole through which a malicious company could profit from the efforts of altruistic programmers. If a person, organization, or community writes an application and gives it away for free, making it part of the public domain and granting all rights in an unrestricted fashion, then what prevents a greedy user from registering the application under his name and trying to profit from the copyright That type of practice had to be somehow avoided without limiting user freedom. Something like that happened to RMS. He was asked to write an application; he agreed to do it and to make it public domain, and was later denied access to the modified version as updated by the same people who had requested it in the first place. But he disliked the idea of copyright, because he thought it was inherently limiting. It gave an author excessive power over his work, letting him or her define what the user could or could not do with it. Copyright was not the solution for RMS. But somehow he had to play by the rules in order to avoid being deprived of the results of his work once again.

Basically, in the Bash environment, an administrator is working with text commands. An example of such a command is ls, which can be used to display a list of files in a directory. Bash has some useful features to make working with these line commands as easy as possible. Some shells offer the option to complete a command automatically. Bash has this feature, but it does more than just complete commands. Bash can complete almost everything: not just commands, but also file names and shell variables.