UNIX -HISTORY Uniplex Information Computing System operating system Developed at bell laboratories Designed by ken Thomson in the lat...
UNIX -HISTORY
AT&T system v interface definition(SV 10)
Unix is a powerful multiuse multi tasking system.
- Uniplex Information Computing System operating system
- Developed at bell laboratories
- Designed by ken Thomson in the late 1960’s
- Unix has been chosen since it is powerful, multiuser, multitasking system. Actually unix was derived from Multics.
- Around 1973, unix was rewritten using c by Dennis Ritchie.
- Around 1976, Unix version 6 was released outside bell labs.
- In 1979, AT&T issued a new version called the unix time sharing system version 7, which supports large files & came with a new extended version of c and a new shell.
- In 1980, Microsoft issued its own version of unix called xenix. In other development university of California developed unix for distributed system with the version no 4.1 BSD(Berkeley s\w distribution)
- By 1982, AT&T offering is system V release 4(SVR4)
AT&T system v interface definition(SV 10)
- Published in 1985 – supports system calls, library routines & utility specifications.
- POSIX – Portable Operating System Interface, defines interface between the unix kernel and the c language.
- XPG3 – x\open co ltd defines a common application environment for unix called XPG3.
- ANSIC – standards based on interface definitions for c program system.
Unix is a powerful multiuse multi tasking system.
- supports rich set of program developed aids like c compiler, make compiler construction tool like yacc & lex etc..
- text formatting tools like textedi toss : vi, & emacs, document : nroff & troff.
- E – mail.
- Source code maintenance system.
- Implemented widely using c hence portable to wide range of computers.
- Simplified treatment of file & device occurs.
- User interface for programmers & online users.
- Supports highly recurred access of information.
