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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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I have been in computing (among other things) since the mid 1950s when a friend and I built a "computer" in the basement. In quotes because it used all vacuum tubes and electro-mechanical relays and as high school students, we could not afford any memory. Could add and subtract -- sort of.
First real machine I ever used was an IBM 704 main-frame with 5000 or so vacuum tubes and lots of diodes. It had 32768 words of magnetic core memory. It did do floating point arithmetic (36-bit machine, but used 2 words for a floating point number). I later used solid state machines, like IBM 7090. My first minicomputer was one I got the company I worked for to buy. We had 16384 24-bit words of memory and two hard drives, each the size of a washing machine. Honeywell DDP-224. I wrote the OS for it.
I also wrote a lot of program for the IBM System/360. I then did a lot of work with UNIX from early 1970s to about 1989 when I retired from there. I then worked about 4 years in another place where I wrote telephone communication code in C++. I am retired now, but still do some coding for my main computer which I built from parts (i.e., boards, processors, hard drives; I did not buy transistors, chips, diodes, ...). It has 2 Xeon processors, 8 GBytes RAM, and 6 Ultra/320 SCSI hard drives and 13 fans (not enough fans, but I cannot put any more in).
It is an overpowered desktop that also serves my old machine which is a little like this one, but only 3 hard drives and 512 Megabyte ram.