Introduction to IT

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Introduction to IT 
Information, Internet, and Computer Technology

The UNIX operating system was first developed in the 1960s, and has been under  development ever since.  It is a stable, multi-user, multi-tasking system for servers, desktops and laptops.

The UNIX operating system is made up of three parts; the kernel, the shell and the programs.

The kernel of UNIX is the hub of the operating system: it allocates time and memory to programs and handles the file storing and communications in response to system calls.

The shell acts as an interface between the user and the kernel. When a user logs in, the login program checks the username and password, and then starts another program called the shell. The shell is a command line interpreter (CLI). It interprets the commands the user types in and arranges for them to be carried out. The commands are themselves programs: when they terminate, the shell gives the user another prompt used to select another program.  

I never used used Unix, but I did use DOS. The Unix and DOS shell had two basic purposes that is to start another program and to provide a directory of files. 

The following lecture about the Unix shell explains DOS  and Windows shells that you are familiar as well as the server side programs such as Unix and Linex operating systems that you may have to learn in order to become an IT expert or IT administrator.









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Last updated: October 15, 2012.