Additional information. I. Google and make the report on one of the topic given below

I. Google and make the report on one of the topic given below.

And discuss the components of any OS.

Task 7 Can you google? Let’s do it!

1. Comparison of operating systems

2. Usage share of operating systems

3. Computer systems architecture

4. Disk operating system

5. Electronic medical record

6. History of IBM mainframe operating systems

7. Interruptible operating system

8. Network operating system

9. Object-oriented operating system

10. System call

11. System image

12. Trusted operating system

13. Hypervisor

UN*X History By Alan Filipski

The UN*X brand operating system was writting by two computer science researchers in a closet in the attic of a famous research laboratory (The Labs) in the late 1960s. The authors had complete freedom to design an operating system according to their own wishes without management constraints. This was because everyone at The Labs, including the management, thought they were janitors who spent their time in the closet wringing out mops or something.

The first version of the UN*X brand operating system was a game that simulated the gravitational motion of all known planets and satellites of our solar system. Soon such things as a file system and user procedures were grafted onto it. It ran on a PDP-7 computer that someone had stored in the closet and forgotten about.

Later the authors made the mistake of drawing attention to themselves by asking the management for a larger computer. At this, the management took the operating system and, supposing it to be something of use only to hippies (or closet hippies), sent it University of California at Berkeley.

It may be coincidental, but at the about the same time cases of a peculiar compulsive mental disorder known as Unirexia Nervosa were first noted in San Francisco, Calif. area. The symptoms of this disorder are the interjection of nonsense words such as grep, awk, runrun, and nohup by the victim into his or her speech; the misuse of ordinary words such as cat and lint; and the avoidance of the use of uppercase letters.

Advanced cases of Unirexia Nervosa have been found at many major universities throughout the U.S., where youths with pasty complexions and sunken eyes can be found late at night subsisting on diet pop, glaring fanatically at CRT's, and mumbling about "one more bugs". Since for the most part this malady has been confined to university students, it has not caused great public alarm. But recently there have been reports of regular people contracting the disease, even some who hold otherwise respectable positions in industry. The mode of transmission of Unirexia Nervosa is not known, but it is thought to have something to do with beards.

Members of the UN*X community have developed a novel and effective means of communication with each other. Suppose a user named Athol at Epizootic Systems in Cupertino, Calif., wishes to send an electronic mail message to his friend Elba at Perjorative Systems Inc. in Palo Alto, Calif. Although their computers do not communicate directly, they message may be passed via intermediate links. Athol would merely type:

mail ihnp4!allegra!ucbvax!seismo!decvax!cbosgd!ucbvax!pejor!elba

and then enter the text of his message. This electronic mail would appear at Elba's terminal either within two days of the time it takes to propagate a telephone signal 73 times between the East and West Coasts of the U.S., whichever is greater.

Although many people think the word "UN*X" is an acronym (or even a homonym), the word actually originated in the following manner. When management in The Labs noticed the strange machine running in the closet, they stopped the first technical-looking type they saw in the hall and asked him what it was. As fate would have it, it was not a technical type at all but a member of a lost Australian aboriginal tribe who had been wandering the halls of The Lab for years without drawing attention. The fellow did not understand English and believed they were asking him to haul the computer away. He replied, "UN*X(tm)," which is aboriginal for "Not my job, man." The rest is history.

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