Lucknow Linux Users group

Unix security model is based on the security of files. In unix everythign is a file including hardware too. Thus you can secure access to hardware in the same way as you secure a file.
Configuration of machine is stored in the form of text files thus it allows an administrator to move a configuration from one machine to another machine easily.
UNIX provides many small utilities that perform one task very well. When new functionality is required the general philosphy is to create a separate program rather than to extand an existing utility with new features.

A core design feature of UNIX is that the output of one program can be the input of another.This is a very great feature as a user can combine many small programs together to perform a larger, more complex task..

Linus Trovalds Finnish College student in 1991 created Linux Kernel.He announced announced Linux in the comp.os.minix newsgroup in August 1991.

Linux is as similar to UNIX as the various UNIX versions to each other. Anythign that can be done with another version of UNIX can be done with the Linux operating system.

Linux is multi user and multi-tasking, i.e. more than one person can be lgged on the same Linux Computer at the same time. (Indeed each user needs his own terminal.).
The same user could even be logged into their account from two or more terminals at the same time.Also Linux is multi-tasking: a user can have more than one process( program) executing at the same time.