Week 1

What is Unix:

        Unix is an operating system. An operating system is a set of
        systems software programs that makes a computer system functional.
        An OS makes the computer system useable. Unix is a very large 
        set of system software programs written in C and assembly.

        Unix is a multitasking, multiprocessing, multiuser operating system.

Unix Architecture:

        Hardware Components, OS programs, Cmds and libraries, shell and
        other user utilities == commands == cmds.

Features of Unix:

        Provides a strong programming environment.
        Provides file structure that is hierarchical for data storage and
                retrieval
        Provides support of various devices like network hardware, disks
                CD-ROM, floppy etc.
        Provides a strong and secure environment for using a computer 
                system.

Unix login procedure:

        How to login, login shell, passwd program, home directory,
        how to logout, shell, command line. 

Unix Utilities:

        cd, pwd, ls, uname, man, who, vi, pico etc. 

        Unix utilities are programs (cmds) available in the system for
        your use. They are resident in the /etc/ /bin /usr/bin /sbin 
        directories

Unix character sets:

        /, \, [], {}, (), #, $, &, %, alphabets, digit characters etc.