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Maybe you re wondering whether Ubuntu Linux is a stable and versatile OS or just one that is free and... you know... better not examined too thoroughly. After all, haven t we all been told that anything free is worth what you paid for it If that is your concern, you should worry no further. Ubuntu, as we stated before, is a distribution of Linux. And Linux is running on quite a lot of computing devices, from tiny ones to gigantic ones. One of the smallest computers in the world, CompuLabs fit-PC,8 runs Ubuntu, and so do many phones. On the other end of the spectrum, the Jaguar,9 the world s most powerful supercomputer, runs Linux as well. That means it is both flexible and powerful. If you look at the computer market as a whole, it seems that desktop computers are the last stronghold outside of the hands of Linux (the reason for that lies elsewhere, not in technical limitations). Is it powerful Of course it is! Of the 500 most powerful computers, as measured by the TOP500 organization in June, 2010,10 91% run some version of Linux. Microsoft Windows runs on just 1% of those computers. This dominance wouldn t be possible if Linux weren t a stable and efficient OS. Once upon a time z/OS, a proprietary OS from IBM, was the only option for the powerful mainframe computers in use today for mission-critical operations in many industries; now, more and more use Linux on System z, accounting today for roughly one third of the mainframes running worldwide. Linux also drives almost half of the servers that make up the Internet. 11 Together with the Apache HTTP server, the MySQL database engine, and programming languages like PHP, Python, and Perl,

Some elements should occur in all shell scripts First, as you ve just read, every shell script should start with the shebang After this, it s a good idea to add some comment lines to explain what the script is for A comment line starts with a pound sign, which ensures that the line is not interpreted by the shell Of course, how you create your scripts is entirely up to you, but starting every script with some comment that explains how to use the script will make your scripts much easier to use It s really a matter of perspective: you know exactly what you re doing at the moment you re writing the script, but months or years later you might have forgotten what your shell script is all about The first line in a good comment shows the exact syntax to be used for launching it.

http://www.fit-pc.com/web/ http://www.nccs.gov/jaguar/ http://www.top500.org/stats/list/35/osfam https://ssl.netcraft.com/ssl-sample-report//CMatch/osdv_all

All is well and good. But we need to be careful. In 2, we looked at how WHERE conditions operate when we make comparisons with a Null (or empty) value. In a WHERE clause, if the value we are comparing is a Null, then the answer will always be false. Therefore, if there is a row in our table with a Null value in the Gender column, it won t be included in either of the queries in Listings 8-2 and 8-3. That means that our counts of members who have Gender = 'F' plus the count of members who have Gender <> 'F' will not add up to the count of all members. We can explicitly find how many of the rows do not have a value for Gender with the query in Listing 8-4. Queries like the one in Listing 8-4 can be very useful for checking the validity of your data before doing any queries involving counts or other statistics.

10 11

After the syntax line, it s normally a good idea to explain in two or three lines what exactly your script is doing Such an explanation makes it much easier for others to use your script the right way If the script starts growing, you may even add comments at other places in the script It s not a bad idea to start every new chunk of code with a short comment, just to explain what it s doing One day you ll be glad that you took the few extra seconds to add a comment or two Apart from the comments, your script naturally includes some commands All legal commands can be used, and you can invoke Bash internal commands as well as work with external commands An internal command is loaded into memory with Bash and therefore can execute very fast.