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The jig saw concept first came about when an engineer attached a saw blade to his wife's sewing machine. Jig saws are used to cut out intricate patterns in the material you are shaping. If you need a curved edge or a circular cut out in the center of your material, a jig saw is the tool to do it. A jig saw blade moves in a rapid up and down motion to cut the material you are working with. The important thing to remember is that your body is softer than the material you are cutting and the blade will cut through you faster than the material. Be observant of where the blade is at all times and avoid cutting yourself. Bosch power tools were the first toolmakers to offer a jig saw to consumers. Bosch power tools are designed to aid in the workplace by being built to withstand the punishment professionals give their tools in the rush to finish work on time. Most are built to withstand a drop of ten feet and still work reliably afterwards. After vibration was noticed as detrimental to the physical health of workers, Bosch power tools set out to reduce vibration from their equipment. Bosch power tools has reduced the vibration by 60% over the years. Along with the low vibration, Bosch power tools are designed for low sound emissions as well. The fan motors are pitched to be less irritating and pointed away from the user as well so little noise directly impacts the worker. Handles and weight distribution are designed to make the tools comfortable to grip and use. Buttons and switches are conveniently placed to make the operation of Bosch power tools easier to do one handed. Bosch power tools even have left handed equipment available. Bosch power tools are ergonomically friendly, tough enough to withstand abusive treatment and quick to make adjustments to while working. This allows more production to be accomplished in a professional setting. This also makes them some of the most expensive available. There is an old saying that you get what you pay for. With Bosch power tools, this is definitely true. Ragib Hasan is a senior year Student of Computer Science and Engineering at Bangladesh University of Engineering and Technology. He is an ardent follower of the Linux movement for free and open operating system and the GNU free software project. His other 3b58 History of Linux by Ragib Hasan (Copyright: Ragib Hasan 2000) Table of Contents a. In The Beginning b. New Baby in the horizon c. Confrontation and development d. Some Linux Cookies e. Ackknowledgments a. In The Beginning It was 1991, and the ruthless agonies of the cold war was gradually coming to an end. There was an air of peace and tranquility that prevailed in the horizon. In the field of computing, a great future seemed to be in the offing, as powerful hardware pushed the limits of the computers beyond what anyone expected. But still, something was missing. And it was the none other than the Operating Systems, where a great void seemed to have appeared. For one thing, DOS was still reigning supreme in its vast empire of personal computers. Bought by Bill Gates from a Seattle hacker for $50,000, the bare bones operating system had sneaked into every corner of the world by virtue of a clever marketing strategy. PC users had no other choice. Apple Macs were better, but with astronomical prices that nobody could afford, they remained a horizon away from the eager millions. The other dedicated camp of computing was the Unix world. But Unix itself was far more expensive. In quest of big money, the Unix vendors priced it high enough to ensure small pc users stayed away from it. The source code of Unix, once taught in 1universities courtesy of Bell Labs, was now cautiously and not published publicly. To add to the frustration of PC users worldwide, the big players in the software market failed to provide an efficient solution to this problem. A solution seemed to appear in form of MINIX. It was written from scratch by Andrew S. Tanenbaum, a dutch professor who wanted to teach his students the inner workings of a real operating system. It was designed to run on the Intel 8086 microprocessors that had flooded the world market. As an operating system, MINIX was not a superb one. But it had the advantage that the source code was available. Anyone who happened to get the book 'Operating System' by Tanenbaum could get hold of the 12,000 lines of code, written in C and assembly language. For the first time, an aspiring programmer or hacker could read the source codes of the operating system, which to that time the software vendors had guarded vigorously. Students of Computer Science all over the world poured over the book, reading through the codes to understand the very system that runs their computer. And one of them was Linus Torvalds. -------------------------------------------------------------------------------- b. New Baby in the Horizon In 1991, Linus Benedict Torvalds was a second year student of Computer Science at the University of Helsinki and a self-taught hacker. The 21 year old sandy haired soft-spoken Finn loved to tinker with the power of the computers and the limits to which the system can be pushed. But all that was lacking was an operating system that could meet the demands of the professionals. MINIX was good, but still it was simply an operating system for the students, designed as a teaching tool rather than an industry strength one. At that time, programmers worldwide were greatly inspired by the GNU project by Richard Stallman, a software movement to provide free and quality software. The much awaited Gnu C compiler was available by then, but there was still no operating system. Even MINIX had to be licensed. Work was going the GNU kernel HURD, but that was not supposed to come out within a few years. That was too much of a delay for Linus. In August 25, 1991 the historic post was sent to the MINIX news group by Linus ..... From: torvalds@klaava.Helsinki.FI (Linus Benedict Torvalds) Newsgroups: comp.os.minix Subject: What would you like to see most in minix? Summary: small poll for my new operating system Message-ID: <1991Aug25.205708.9541@klaava.Helsinki.FI> Date: 25 Aug 91 20:57:08 GMT Organization: University of Helsinki Hello everybody out there using minix - I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones. This has been brewing ; since april, and is starting to get ready. I'd like any feedback on things people like/dislike in minix, as my OS resembles it somewhat (same physical layout of the file-system (due to practical reasons) among other things). I've currently ported bash(1.08) and gcc(1.40),and things seem to work.This implies that I'll get something practical within a few months, andI'd like to know what features most people would want. Any suggestions are welcome, but I won't promise I'll implement them :-) Linus (torvalds@kruuna.helsinki.fi) PS. Yes - it's free of any minix code, and it has a multi-threaded fs. It is NOT protable (uses 386 task switching etc), and it probably never will support anything other than AT-harddisks, as that's all I have :-(. As it is apparent from the posting, Linus himself didn't believe that his creation was going to be big enough to change computing forever. Linux version 0.01 was released by mid september 1991, and was put on the net. Enthusiasm gathered around this new kid on the block, and codes were downloaded, tested, tweaked, and returned to Linus. 0.02 came on October 5th, along with this famous declaration from Linus: From: torvalds@klaava.Helsinki.FI (Linus Benedict Torvalds) Newsgroups: comp.os.minix Subject: Free minix-like kernel sources for 386-AT Message-ID: <1991Oct5.054106.4647@klaava.Helsinki.FI> Date: 5 Oct 91 05:41:06 GMT Organization: University of Helsinki Do you pine for the nice days of minix-1.1, when men were men and wrote their own device drivers? Are you without a nice project and just dying to cut your teeth on a OS you can try to modify for your ; needs? Are you finding it frustrating when everything works on minix? No more all-nighters to get a nifty program working? Then this post might be just for you :-) As I mentioned a month(?) ago, I'm working on a free version of a minix-lookalike for AT-386 computers. It has finally reached the stage where it's even usable (though may not be depending on what you want), and I am willing to put out the sources for wider distribution. It is just version 0.02 (+1 (very small) patch already), but I've successfully run bash/gcc/gnu-make/gnu-sed/compress etc under it. Sources for this pet project of mine can be found at nic.funet.fi (128.214.6.100) in the directory /pub/OS/Linux. The directory also contains some README-file and a couple of binaries to work under linux (bash, update and gcc, what more can you ask for :-). Full kernel source is provided, as no minix code has been used. Library sources are only partially free, so that cannot be distributed currently. The system is able to compile as-is and has been known to work. Heh. Sources to the binaries (bash and gcc) can be found at the same place in /pub/gnu. Linux version 0.03 came in a few weeks. By December came version 0.10. Still Linux was little more than in skeletal form. It had only support for AT hard disks, had no login ( booted directly to bash). version 0.11 was much better with support for multilingual keyboards, floppy disk drivers, support for VGA,EGA, Hercules etc. The version numbers went directly from 0.12 to 0.95 and 0.96 and so on. Soon the code went worldwide via ftp sites at Finland and elsewhere. back -------------------------------------------------------------------------------- c. Confrontation & Development Soon Linus faced some confrontation from none other than Andrew Tanenbaum, the great teacher who wrote MINIX. In a post to Linus, Tanenbaum commented: I still maintain the point that designing a monolithic kernel in 1991 is a fundamental error. Be thankful you are not my student. You would not get a high grade for such a design :-) (Andrew Tanenbaum to Linus Torvalds) Linus later admitted that it was the worst point of his development of Linux. Tanenbaum was certainly the famous professor, and anything he said certainly mattered. But he was wrong with Linux, for Linus was one stubborn guy who won't admit defeat. Tanenbaum also remarked that : Linux is obsolete. Now was the turn for the new Linux generation. Backed by the strong Linux community, Linus gave a reply to Tanenbaum which seems to be most fitting: Your job is being a professor and researcher: That's one hell of a good excuse for some of the brain-damages of minix. (Linus Torvalds to Andrew Tanenbaum) And work went on. Soon more than a hundred people joined the Linux camp. Then thousands. Then hundreds of thousands. This was no longer a hackers toy. Powered by a plethora of programs from the GNU project, Linux was ready for the actual showdown. It was licensed under GNU General Public License, thus ensuring that the source codes will be free for all to copy, study and to change. Students and computer programmers grabbed it. Soon, commercial vendors moved in. Linux itself was, and is free. What the vendors did was to compile up various software and gather them in a distributable format, more like the other operating systems with which people were more familiar. Red Hat , Caldera, Debian, and some other companies gained substantial amount of response from the users worldwide. With the new Graphical User Interfaces (like X-windows, KDE) the Linux distributions became very popular. Meanwhile, there were amazing things happening with Linux. Engineers have tweaked Linux to run 3Com's handheld PalmPilot computer. Red Hat Software's version of Linux won the 1996 award for bestdesktop computer operating system from trade magazine InfoWorld. In April that year researchers at Los Alamos National Laboratory used Linux to run 68 PCs as a single parallel processing machine to simulate atomic shock waves.The do-it-yourself supercomputer cost only $152,000, including labor (connecting the 68 PCs with cables)-about one tenth the price of a comparable commercial machine. It reached a peak speed of 19 billion calculations per second, making it the 315th most powerful supercomputer in the world. Three months later it still didn't have to be rebooted. The best thing about Linux today is the fanatic following it commands. Whenever a new piece of hardware is out, Linux kernel is tweaked to take advantage of it. For example, within weeks after the introduction of Intel Xeon® Microprocessor, Linux kernel was tweaked and was ready for it. It has also been adapted for use in Alpha, Mac, PowerPC, and even for palmtops, a feat which is hardly matched by any other operating system. And it continues its journey into the new millenium, with the same enthusiasm that started one fine day back in 1991. As for Linus, he remains a simple man. Unlike Bill Gates, he is not a billionaire. Having completed studies, he moved to USA and landed a job at Transmeta Corporation. Recently married, he is the proud father of a girl, Patricia Miranda Torvalds. But he remains as the world's most favorite and most famous programmer to this date. Revered by Computer communities worldwide, Linus is by far the most popular programmer on this planet. He deserves it. Epilogue 2000 The year 2000 started as the beginning of a new century, and of course, a brand new millenium. With the ever increasing popularity of Linux sky-rocketing to new heights, it was clear that Linux was to stay as an inevitable part of computing in the 3rd Millenium. And the father of Linux, Linus Torvalds also created headlines when his company Transmeta Corporation delivered the ultimate result of their secret product, the amazing Crusoe(TM) processor. Linus worked from the beginning as a project member, and the resultant Crusoe processor is another testimony to his remarkable abilities as a dreamer. One thing is clear, The Future Belongs To Linux! Acknowledgements History is always boring, but history of Computing and that of Linux are very interesting. Much of the source of this article has been taken from the Internet. It was inspired by the questions asked by many would be Linux users at meetings and postings of Bangladesh Linux Users Group.Thanks to all. All materials taken from various sources belong to their respective authors. All trademarks belong to the respective corporations and companies. Microsoft and Windows are registered trademarks of Microsoft corp. The author fully reserve the right to the portions of this article written solely by himself, under Gnu GPL. However all are requested to distribute this article freely and vigorosly provided my name and email address is given clearly with this article. ( If this legal things bore you, don't blame me. Who knows, Microsoft lawyers might find a way to sue for their Logo or name... :) ). For all mistakes and suggestions Contact me: Ragib Hasan, Department of Computer Science & Engineering, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh. mail me at ragibhasan@yahoo.com About the AuthorRagib Hasan is a senior year Student of Computer Science and Engineering at Bangladesh University of Engineering and Technology. He is an ardent follower of the Linux movement for free and open operating system and the GNU free software project. His other interests include Computer Programming (He is an award winning programmer), writing and Science fiction. A member of IEEE and BDLUG, he hopes for a better tomorrow. He can be reached at ragibhasan@yahoo.com 2chttp://www.aaarticles.com/article.php?id=3948 | ||||||||||||||||||||
