COMS W1004 Introduction to Computer Science
... Thompson created a high-level programming language called B Dennis Ritchie created a better implementation called C Thompson and Ritchie rewrote UNIX in C ...
... Thompson created a high-level programming language called B Dennis Ritchie created a better implementation called C Thompson and Ritchie rewrote UNIX in C ...
Chapter 2
... • Integrates features from all other versions (SVR3, 4BSD, SunOS, XENIX) • Introduced real-time scheduling • AT&T sold its interest in UNIX to Novell in ...
... • Integrates features from all other versions (SVR3, 4BSD, SunOS, XENIX) • Introduced real-time scheduling • AT&T sold its interest in UNIX to Novell in ...
Unix – Linux
... environment that is separated from other users sharing the computer’s resources. – Access is through a verification process known as logging-in: Enter a user-id and password. – The OS creates an environment known as the “shell” for the user after the login is complete. ...
... environment that is separated from other users sharing the computer’s resources. – Access is through a verification process known as logging-in: Enter a user-id and password. – The OS creates an environment known as the “shell” for the user after the login is complete. ...
CS4023_-_lecture_02_..
... Over the next few years UNIX was rewritten in Thompson’s B language and then in Denis Ritchie’s C language. AT&T was not allowed to sell UNIX. UNIX’s source code was distributed to universities for a small fee. A group at the University of California at Berkeley modified the UNIX source code to cr ...
... Over the next few years UNIX was rewritten in Thompson’s B language and then in Denis Ritchie’s C language. AT&T was not allowed to sell UNIX. UNIX’s source code was distributed to universities for a small fee. A group at the University of California at Berkeley modified the UNIX source code to cr ...
Work with Files and Directories
... How It All Clicked • Till UNIX came on scene, operating systems were designed with a particular machine in mind. Programs designed for one system simply wouldn’t run on another. • Ken Thompson and Dennis Ritchie designed and built a small system having an elegant file system, a command interpreter ...
... How It All Clicked • Till UNIX came on scene, operating systems were designed with a particular machine in mind. Programs designed for one system simply wouldn’t run on another. • Ken Thompson and Dennis Ritchie designed and built a small system having an elegant file system, a command interpreter ...
quiz1-s3
... Turn off interrupts. d) Access I/O device. 2. Which of the following would lead you to believe that a given system is an SMP-type system? a) Each processor is assigned a specific task. b) There is a boss–worker relationship between the processors. c) Each processor performs all tasks within the oper ...
... Turn off interrupts. d) Access I/O device. 2. Which of the following would lead you to believe that a given system is an SMP-type system? a) Each processor is assigned a specific task. b) There is a boss–worker relationship between the processors. c) Each processor performs all tasks within the oper ...
Berkeley Software Distribution
Berkeley Software Distribution (BSD) is a Unix operating system derivative developed and distributed by the Computer Systems Research Group (CSRG) of the University of California, Berkeley, from 1977 to 1995. Today the term ""BSD"" is often used non-specifically to refer to any of the BSD descendants which together form a branch of the family of Unix-like operating systems. Operating systems derived from the original BSD code remain actively developed and widely used.Historically, BSD has been considered a branch of Unix, Berkeley Unix, because it shared the initial codebase and design with the original AT&T Unix operating system. In the 1980s, BSD was widely adopted by vendors of workstation-class systems in the form of proprietary Unix variants such as DEC ULTRIX and Sun Microsystems SunOS. This can be attributed to the ease with which it could be licensed, and the familiarity the founders of many technology companies of the time had with it.Although these proprietary BSD derivatives were largely superseded by the UNIX System V Release 4 and OSF/1 systems in the 1990s (both of which incorporated BSD code and are the basis of other modern Unix systems), later BSD releases provided a basis for several open source development projects, e.g. FreeBSD, OpenBSD, NetBSD, Darwin or PC-BSD, that are ongoing. These, in turn, have been incorporated in whole or in part in modern proprietary operating systems, e.g. the TCP/IP networking code in Windows NT 3.1 and most of the foundation of Apple's OS X and iOS.