Sunday, 25 September 2016

Linux online training

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LINUX ONLINE TRAINING:
Linux online training is which where you can learn the LINUX course through online training mode. Before going into details of Linux let me tell you people about online training first. Online training is getting trained about a course through online sitting at our place and learning at our convenient time. Online training has become the main gateway for every one in this competitive world. We don't have enough time to go to class and learn a class or something, so the way which makes our learning easier is online training. So now let me tell you in detail about Linux online training, its scope, career and everything about Linux. Here I have given everything in detail that you need to know about Linux.

WHAT IS LINUX?
Linux is operating systems, which manages hardware resources and provide an environment where applications can run. The operating system allows applications to store information, send documents to printers, and interact with users and other things. Linux refers to the whole Linux operating system, but sometimes it can refer to just the Linux kernel as well. The linex kernel is the core of the operating system. It’s the layer that is between the hardware and applications. In addition to kernel there are additional useful components that make the operating system useful. The components are libraries, graphical user interfaces, email utilities, web browsers and other programs.Linux is open source software.  This means that anyone can use, copy, study and change the software in any way they chose so, as long as the source code is openly shared with others. Linux runs on many hardware platforms from dedicated networking devices to phone to personal computers and even super computers.

OVERVIEW:
Thousands of people made improvements to Linux. With Linux being free and open source software, it has led to the rise of Linux distributions. In every case the source code is free, but in some cases, the distribution is not free - the binaries the complied code is not free. A Linux distribution is the Linux kernel and a collection of software that together, create an operating system. Each distribution has its own goals and areas of focus. Choice of distribution will depend on what you are trying to accomplish. These are distributions that are commercial and non-commercial. Distributions that are designed for server use, desktop use, and some that focuses on research and science. Some are for multimedia.Linux runs on many hardware platforms from dedicated networking devices to phone to personal computers and even super computers.Linux which began its existence as a server os and has become useful as a desktop os can also be used on all other devices like from wristwatches to super computers.

SCOPE:
Linux is already successful on many different kinds of devices. But there are also many technological areas where Linux is moving towards, even as a desktop and server development continues to grow faster than any other operating system today. Linux is being installed in the system ios of laptops and notebook computers, which will enable users to turn their devices in a matter of seconds, bringing up a standard Linux environment.Linux is showing up on mobile internet devices. The growth of cloud computing is a natural fit for Linux which already runs many of the internet web services. Companies participating in the Linux economy share research and development costs with their partners and competitors. Many of the popular web 20 services on the internet such as twitter, linked in, YouTube, and Google all rely on Linux as their operating system.

CAREERS:
The world of open source software is an ever changing landscape. What appears to be the next big thing may fall by the wayside by some new development tool. The pace is fast and furious, and it does not look like it is going to slow down anytime soon.
The most likely jobs that a Linux professional gets are the following:
Software engineer – median salary per  annum is $83,266
Senior software engineer -  median salary per annum is  $108,324
Software developer – median salary per annum  is  $71,226
Linux system engineer –median salary per annum is  $73,526
Senior systems engineer – median salary per annum is $100,139
Linux administrators – median salary per annum is $61,864
Information technology manager – median salary per annum is $82,324
Linux technical system engineer
Kernel core file system engineer
Senior Linux  automation administrators
Site reliability engineer
There are many more job profiles available for Linux professionals. The pay scale may sometimes differ according to the experience to some of the categories.

CONCLUSION:
With every business increasingly becoming data device, living managers across different spectrums are looking to strengthen their tech teams.An abbreviated list of some of the popular electronic devices Linux is used on today includes:
Dell inspiron mini 9 and 12
Garmin nuvi 860,880 and 5000
Google android dev phone 1
HP Mini 1000
Lenovo Idea Pad s9
Motorola motorokr EM35 phone
One laptop per child xo2
Sony bravia television
TiVo digital video recorder
Volvo in-car navigation system
Yamaha motif keyboard
These are the most recent examples and actual numbers of items that use Linux numbers in thousands.
And Linux professionals hold an advantage here.
SO ONE CAN GO AHEAD AND LEARN THE COURSE WIITOUT HAVING ANY DOUBT FOR GETTING DOWNN IN THE INDUSTRY......

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Friday, 27 September 2013

Top 10 Linux Interview Questions With Answers

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The article "Top 10 Linux Interview Questions With Answers" is very much helpful for the job seekers in Linux Admin.




1. Define Linux?


Ans: The operating system that is based on UNIX is known as LINUX. This operating system is completely based on Linux Kernel and it can be run on different hardware platforms that are perfectly manufactured by MIPS, IBM, Intel, Motorola and SPARC. Mascot is the other famous element in Linux.



2. Define LILO?

Ans: LILO stands for Linux boot loader. It will load the master boot record into the memory, and tell the system which separation and hard drive to boot from.



3. Name some basic components of LINUX?

Ans: Usually, it is like other operating system, LINUX has specific components like kernel, system utilities, shells and GUIs, application program. What makes LINUX useful when compared to other operating systems is all aspects with some extra features and codes can be downloaded for free.



4. Define ephemeral port in UNIX?

Ans: Ephemeral ports are port used by Operating system for consumer sockets. There is a specific range on which OS can open any port particular by ephemeral port range.



5. Define GRUB?

Ans: GNU GRUB is a Multiboot boot loader. GRUB stands for GRand Unified Bootloader, which was originally designed and executed by Erich Stefan Boleyn. In brief, a boot loader is the first software program that runs when a computer starts. It is liable for loading and transferring control to the operating system kernel software. 



6.  Define CVS? Name some useful CVS commands?

Ans: CVS is Concurrent Version System. It is the front end to the RCS revision control system which extends the concept of revision control from a collection of files in a single directory to a hierarchical collection of directories consisting of revision controlled files. These address list and files can be combined together to form a software release.
Some useful commands:
  1. cvs checkout
  2. cvs update
  3. cvs add
  4. cvs remove
  5. cvs commit



7.  What is inode number in Linux?


Ans: An inode is a data structure on a usual Unix-style file system such as UFS or ext3. An inode stores fundamental information about a regular file, directory, or other file system object.  iNode number also called as index number.



8.  What is a zombie?

Ans: Zombie processes can be recognized in the output of ‘ps’ by the presence of ‘Z’ in the STAT column. Zombies are child processes whose parent process died without reaping its children. Zombies can’t be killed with the usual KILL signal. 



9.  Explain about MX record?

Ans: MX record numerically ranks the mail servers you would choose to receive email for a domain. The MX record with the lowest number is chosen over the others, but you can set multiple email servers with the same value for simple load balancing.



10. Define TCP hand shake?

Ans: TCP requires three packets to set up a socket connection, before any user data can be sent. This is called the tree way TCP handshake. First the requester sends a SYN packet and expects a SYN-ACK packet, to which the initiator replies with ACK packet plus the first chunk of user data. 
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