UNIX ORIGIN
First version of UNIX was developed at AT & T by Dennis Ritchie and Ken Thempon at Bell Labs in 1969. Many other "flavours" emerged later.
Solaris --------------------> Sun Microsystem (NOW,Oracle)
AIX --------------------> IBM
HP / UX --------------------> HP
XENIX --------------------> Microsoft
Minux --------------------> Andrew Tananbaum
Linux --------------------> Linus Torvalds
GNU
This project was established in 1984.
- Its main goal was to create "free" UNIX clove.
- By 1990, almost all major applications required by users were developed.
LINUX ORIGIN
In 1991, a Finish college student, Linus Torvalds, developed "Linus" kernel.
When "linux" kernel combined with GNU's application and shell, a complete Unix-based OS came in existence.
OPEN SOURCE SOFTWARE
Any software that satisfies the following criteria are open source software (OSS) or free open source software (FOSS).
- Software that can be downloaded freely.
- Software that can be studied and modified freely.
- Software that can be redistributed freely.
Examples: Linux, PHP, MYSQL, Python, Apache etc..
LAMP: Linux, Apache, Maria / MYSQL, PHP
Linux Distributors: Red Hat, Ubuntu, Debian, openSUSE, Backtrack, Kali etc..
LINUX / UNIX PRINCIPLES
- Everything is a file including hardware.
- Configuration files are in text form.
- Avoid use of GUI.
- Small single purpose commands.
- Small programmes can be combined together to perform complex tasks.
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