Unix操作系统【英文】

History of Unix

Ken Thompson (recently retired from Bell Labs) is on left, and Dennis Ritchie is in the middle. What`s his name is on the right…
UNIX Features



The Unix OS is a multi-user OS allowing more that more person to directly communicate with the computer. Although the OS can only work on one task at a time, a small piece of time (time slice) is dedicated to each task or user - this is referred to as “time-sharing”. Time sharing gives the illusion that the CPU is giving all the users its full attention


The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space wars” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do one thing well (i.e. UNIX). Pipes could be used combine commands...
History of Unix OS


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The first versions of UNIX were written in “machine-dependent” program (such as PDP-7). Ken Thompson approached Dennis Ritchie, developer of C language, and in 1973 they compiled UNIX in C to make operating system “portable” to other computers systems.
OPS224
Operating Systems - Unix
Agenda

Overview of OPS224

Discuss Course Outline Evaluation Class Standards / Required Materials

Purpose of an Operating System (OS) History Unix / Linux OS Characteristics of Unix / Linux OS
Class Standards (See Instructor’s Website)



Evaluation Attendance / Participation Late Assignments Missed Tests Missed Final Exam Things that Annoy Instructor Cheating / Plagiarism
How to Contact Instructor
Room #: 2198 Telephone #: (416) 491-5050 x 3208 E-mail: david.ward@senecac.on.ca Instructor’s Website: cs.senecac.on.ca/~dward Course Website: cs.senecac.on.ca/~ops224


allocates computer resources schedules routine tasks provides a platform to run application software for users to accomplish tasks provides an interface between the user & the computer
Enter data in files to be later processed
Note: batch processing lacks the advantage of immediate feedback as opposed to online processing
History of Unix OS

Read pages 3 to 17
Definition of an Operating System (OS)
An operating system is a control program for a computer that performs the following operations:
Required Text
A Practical Guide to Linux, by Mark Sobell. Publisher: Addison-Wesley; ISBN 0-201-89549-8.
Attention
These PowerPoint notes are based on Chapter 1 of textbook “A Practical Guide to Linux”
History of Unix OS


Prior to Unix, many operating systems ran collections or “batches” of operations one at a time. This single-user “batch-processing” approach did not take advantage of the potential processing power and speed of computers Process Collection or “Batch” of files Receive information of processed data