Presentation by:Isaac George

14PT15

What am I going to talk about?

A Brief Introduction…….

Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others

The history of Unix dates back to the mid-1960s when the Massachusetts Institute of Technology, AT&T Bell Labs, and General Electric were jointly developing an experimental time sharing operating system called Multics for the GE-645 mainframe. Multics introduced many innovations, but had many problems.Bell Labs, frustrated by the size and complexity of Multics but not the aims, slowly pulled out of the project. Their last researchers to leave Multics, Ken Thompson, Dennis Ritchie, Doug McIlroy, and Joe Ossanna, decided to redo the work on a much smaller scale.

Some important people in it’s history………………

Ken Thompson(Creator of – B programming

language, co-creator of Unix)

Dennis Ritchie(Creator of – C programming language, co-

creator of Unix)

Brian Kernighan(Co-creator of AWK and AMPL programming languages, co-creator of Unix)

Douglas McIlroy(Co-creator of Unix [pipelines],Also the tools like – diff, tr, sort and join)

Joe Ossanna(Co-creator of Unix, developer of troff [which is uased to creates documents like man pages]

Unix Philosophy

According to Douglas McIlroy:

This is the Unix philosophy: Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface.

In the end all of it adds up to-

Small is beautiful.

Make each program do one thing well.

Build a prototype as soon as possible.

Choose portability over efficiency.

Store data in flat text files.

Use software leverage to your advantage.

Use shell scripts to increase leverage and portability.

Avoid captive user interfaces.

Make every program a filter.

Why is Unix superior?

• The command line interface.• Various shells, including their script syntax.• Builtin programming language support for many languages.• Common Unix utilities, such as grep, rsync, ssh, lsof, and others.• All the supported filesystems (ZFS, Ext4, Reiser, UFS, etc.).• Overall rock-solid stability and reliability.• Lack of viruses, trojans, and other malware.• Tremendous networking capabilities (PPoE, TCP/IP, etc.).• Bulletproof firewall software.• Overall builtin security in general (MACs, PAM, etc.).• Quality user/group management.• System resource usage.• Both vertical and horizontal scaling.• Portability.• Plain text configuration files.• Open source kernel and user-space software.• Based on standards (POSIX, FHS, LSB, etc.).• Vast selection of software choices (various text editors, MUAs, etc.)• Simplicity in software design- do one thing, and do it well.• Mind-blowing hardware support.• Support for hundreds of languages and locales out of the box.

Open-Source Software

Cross-Platform Portability and Open Standards

The Internet and the World Wide Web

The Open-Source Community

Unix Is Fun to Hack

The Lessons of Unix Can Be Applied Elsewhere

GNU

Year - 2038

The original Unix time datatype (time_t) stores a date and time as a signed long integer (on 32 bit systems a 32-bit integer) representing the number of seconds since 1 January 1970. During and after 2038, this number will exceed 231 − 1, the largest number representable by a signed long integer on 32 bit systems, causing the Year 2038 problem (also known as the Unix Millennium bug or Y2K38).

Thank you