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Linux is an operating system and open source platforms which allows developers to work on plenty of applications, functions, features and add-ons that are guaranteed to improve your user experience. Even if you are a Windows user, knowing how to use Linux is a valuable skill. May be you want to get rid of the virus in your system or you want to cut on costs or to learn a skill that could get you a job. All of these can be achieved by learning the Linux course by Twenty19.

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  1. Chapter 1

  2. Chapter 2

  3. Chapter 3

  4. Chapter 4

    • 4.1 - Directory Structure
    • 4.2 - File and Folder Hierarchy
  5. Chapter 5

    • 5.1 - Basic Commands
    • 5.2 - File and Directory
  6. Chapter 6

    • 6.1 - User and Group
    • 6.2 - Networking
    • 6.3 - File Concepts
  7. Chapter 7

    • 7- Package Management
  8. Chapter 8

    • 8.1 - Shell Commands and Arguments
    • 8.2 - Control Operators
    • 8.3 - Variables
  9. Chapter 9

    • 9- Shell Scripting
  10. Chapter 10

    • 10.1 - Disk Management: Disk Devices
    • 10.2 - Partitioning
    • 10.3 - File System
    • 10.4 - Mounting
  11. Chapter 11

    • 11.1 - Basic Unix/ Linux Tools
  • About this Training

    In this course, you will learn about the basics of Linux such as Installation, Commands, User creation, Files and Access modes.Following this, the course will cover topics such as Shell scripting, Software management, Networking and Linux processes. Lastly, you will have a comprehensive learning about Linux system performance and Capacity administration. Upon completion, you will have a good working knowledge of Linux.

  • Project in this Training

    During the course, we will be doing projects on Networking, Shell scripting, System performance and Capacity administration which will enable you to continue your progress as either a user, system administrator or developer using the acquired skill set.

  • Clear your Doubts

    You can ask all the questions in Clear your Doubts forum anytime, course experts will answer all your questions.

  • Get Certificate

    Receive an E-certificate from us once you complete the course. You can Download the Certificate from your Twenty19 account and also showcase it to your friends and family.

Release Candidate

asked by Ravishankar-SubramaniIyer

Release Candidate (RC) is the build released internally to check if any critical problems have gone undetected into the code during the previous development period. Release candidates are NOT for production deployment, but they are for testing purposes only. However, in most of the cases, there are no differences between the final build and the last release candidate.

answered by VikasMishra, [ Nov, 2017 ]

Difference beteen /temp/ and /var//

asked by Ravishankar-SubramaniIyer

There are two directory ie, /tmp and /var/tmp.
/tmp is meant as fast (possibly small) storage with a short lifetime. Many systems clean /tmp very fast - on some systems it is even mounted as RAM-disk. /var/tmp is normally located on a physical disk, is larger and can hold temporary files for a longer time. Some systems also clean /var/tmp, but less often.

Also note that /var/tmp might not be available in the early boot-process, as /var and/or /var/tmp may be mountpoints. Thus it is a little bit comparable to the difference between /bin and /usr/bin. The first is available during early boot - the latter after the system has mounted everything. So most boot-scripts will use /tmp and not /var/tmp for temporary files.

Another (upcoming) location on Linux for temporary files is /dev/shm.

answered by VikasMishra, [ Nov, 2017 ]

About /sbin/

asked by Ravishankar-SubramaniIyer

No Answers yet

Course Duration

asked by Ravishankar-SubramaniIyer

Hi,the videos and training for any course in Twenty19 .com has lifetime access.So,as you have enrolled for LINUX Training you will get access for training videos for lifetime and you can also clear your doubts related to course any time.

answered by VikasMishra, [ Oct, 2017 ]

Hi,the videos and training for any course in Twenty19 .com has lifetime access.So,as you have enrolled for LINUX Training you will get access for training videos for lifetime and you can also clear your doubts related to course any time.

answered by VikasMishra, [ Oct, 2017 ]


asked by AshwaniMishra

Ifconfig command is useful for changing or applyying networking parameters.

Or we can use system-config-network command to use simple user interface for setting up same. All these things have been mentioned in course videos step by step.

answered by Twenty19Expert Team, [ Jul, 2015 ]

1.To get started, type ifconfig into the terminal and hit Enter, take note of the name of the interface that you want to change the settings for.

2.To change the settings, you also use the ifconfig command, this time with a few parameters:

sudo ifconfig eth0 netmask

The interface that you want to change the IP for is eth0
Thats all for changing the IP.

answered by VikasMishra, [ Jul, 2017 ]

Hard Link

asked by YashKaranwal

Hard Link acts like a mirror copy of the original file. These links share the same inodes. Hard links can't cross file systems.

Because hard link is something which is directly pointed to the memory can hard two names to a memory location and use both the names to access that location.even if one name is deleted.the memory is not can access it from the other name.

So but the directory is not a memory location. It may be a pointer or a structure that points to all the files that are present in that directory.

So a soft link can be created for that.soft links are something which points to the pointer that points to the memory. So it can even point to a directory.

answered by VikasMishra, [ Jul, 2017 ]

directory structure


For command line, these should work:

useradd -m USERNAME
You have to use -m, otherwise no home directory will be created. If you want to specify the path of the home directory, use -d and specify the path:

You can then set the password with:

All of the above need to be run as root, or with the sudo command beforehand.
run man adduser for more information.

answered by VikasMishra, [ Jul, 2017 ]


asked by vishnukalyan

CentOS or RedHat Linux is recommended for this course, as we will be discussing specific details of REDHAT based distribution.

answered by , [ Feb, 2016 ]

dual boot

asked by Govindkumar

answered by , [ Dec, 2015 ]

dual boot

asked by Govindkumar

answered by , [ Dec, 2015 ]

Can I download the videos & learn?

You can re-watch the videos as many times you wish but we do not allow downloading on our platform as we keep track of your progress in regards to the course you learn.

What is special about Twenty19 courses?

Twenty19 Training are fun to learn and they are structured to be easily understood by anyone.The courses are developed with College students in mind.So courses will have a lot of real world examples and Twenty19 courses are easy to take up and earn a certificate.

If I have any doubt while learning, How can I clear my doubts?

You can raise your doubt in Clear your doubts forum anytime, training experts will answer all your questions. You can also reach us at +91 9962033243 (give us a missed call), send an SMS or drop an email to, one of our team member will call you to support.

Is it safe to use my debit/credit card for making the payment?

No doubt, Your transaction is always safe and secure with Twenty19.

Do I get a certificate of completion?

Yes!! you will receive an E-certificate from us once you complete the training. You can include this is in your Resume to get placed better.

How will I receive the certificate?

Twenty19 certificates will be emailed to your Twenty19 registered Email ID .The very next day of your training completion you will be receiving the certificate.You can download and print your certificate.

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