What is UNIX and Linux?

1, History of UNIX

=> UNIX is an Operating System (OS).

=> UNIX was developed about 40 years ago i.e., 1969 at AT&T Bell Labs by Ken Thompson and Dennis Ritche.

=> It is a Command Line Interpreter. v It was developed for the Mini-Computers as a time sharing system.

=> UNIX was the predecessor of LINUX.

2. History of LINUX

=> LINUX was created by Linus Torvalds in 1991.

=> LINUX is a open source.

=> LINUX is a variant of UNIX.

3. Why LINUX/UNIX?

=> LINUX is free.

=> Can view and edit the source code of OS v It is fully customizable.

=> Most Important Feature is Stability

=> 30Years to get the bugs

=> Important in shared environments and critical applications

=> LINUX has better security structure.

=> High Portability.

=>Easy to port new H/W Platform.

=>Written in C which is highly portable

Source: LINUX TUTORIAL

Comments

Object Oriented Programming

Object Oriented Programming Programming paradigm that represents the concept of "objects" that have data fields (attributes that describe the object) and associated procedures known as methods Programming methodology based on objects, instead of just functions and procedures Focuses on data rather than process As individual objects can be modified without affecting other aspects of the program, it is easier for programmers to structure and organize software programs Easier to update and change programs written in object-oriented languages Simula was the first object oriented programming language Eg: C++, Java, etc. Features of OOPS Objects Referred as instance of class Basic run-time entities in an object-oriented system a person, a place, a bank account, a table of data, etc can be an object They occupy space in memory that keeps its state Each object contains data and code to manipulate the data Classes Blue print or prototype which defi

WAP to find given word is palindrome or not.

/*program to find palindrome*/ #include<stdio.h> #include<conio.h> #include<string.h> void main() { char a[30],str[30]; clrscr(); printf("Enter a string\n"); scanf("%s",&str); strcpy(a,str); strrev(a); if(strcmp(str,a)==0) printf("String is palindrome\n"); else printf("String is not palindrome\n"); getch(); }

2. Star Network topology

In star topology all devices or computers are connected to one centralized server. They are connected with server by hub. Star topology is used in that network where end points are directly reachable from central location. Because each nodes link to the server by different cables. There is no risk of data collisions. Each computer connected to the hub by its own cable segments only a single computer can transmit at a time and every computer on the network wait for message. Thus it is best on broadcasting architecture. a. Advantages i. Devices are attached to server by its own cable, thus break down of cable affects only to that nodes. ii. Failure of single node will not affect the rest of the network. iii. Central hub can be represent with other having more ports to plugs the nodes. b. Disadvantages i. Failure of central hub will affect whole network. ii. More expens

Learning posts

Search This Blog