Linux Technical Interview Questions And Answers 2021

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Last updated 11/2021
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Linux 15+ hours of practical technical interview questions, answers and explanations to Ace the Linux job interview 2020

What you'll learn
You will be able to answer most of the Linux Technical Interview Questions
Students will be able to Ace the technical interview
Students will be able to get their dream Linux job
Student will be confident to answer most of the technical questions
Interviewer will be able to ask excellent Linux Technical questions
Students will have better understanding of why certain questions are asked and how to answer them
Students will be able to identify their weak areas and address them

Requirements
Familiarity and understanding of Linux basics.
Desire to get Linux jobs
This course is with assumption that you have a Linux machine already either running on a physical server or virtual server

Description
Do you have all the Linux skills to qualify for the job but not getting much luck in the interview? Are you starting out a new career in Linux or IT and need help in interview?Are you looking for all the tools and tips as to how to ACE technical interview?If you answer is YES to any of the above questions then you have reached the right course. I will help you guide through how to overcome some technical interview hurdles. Welcome to the Linux Technical interview Questions and Answers 2020 where you are going to dominate the Linux Technical job interview. Take the course, learn the material and go into technical interview with a confidence that you are prepared!Get an edge over other candidates that did not take the time to learn technical interview skills.Become one of my dozens of students that successfully took the course and secured a job.This course has been expertly crafted to make sure that you rapidly improve your Linux interview skills, Turbocharge your productivity and Boost your career with no time wasting and no useless fluff.Here is some testimonials from our students:=T

ESTIMONIALS "Very very useful Thanks " ----- Ambadas Bhagat ★★★★★"I enrolled in this course having some familiarity with Linux but not much. Content was very well presented and documented for beginners and for those who are little bit familiar with the Linux.It covers almost all aspects of Linux. I am fully satisfied. " ----- Peter Lucic ★★★★★"Great. This course gives me a lot of knowledge on Linux. It helps my work a lot. Thank you". ----- Le Hoang Son ★★★★★ ----- Michele Berardi ★★★★★ ----- Bo Liu ★★★★★ ----- Gail Edmondson ★★★★★ ----- Pooja Babu ★★★★★ ----- Latenis Dent ★★★★★There is no reason for you to study Linux for months and years and not succeed in securing a job because of a Technical Interview.Linux system Troubleshooting - Part 11- How to view all messages generated by the system since the last reboot on RHEL7/CentOS 7?2- How to check log messages related to kernel?3- How can you continuously monitor logs as they come in?
4- Where can you find messages related to the installation of Linux?
5- Where are most of the log files located?Linux system Troubleshooting - Part 2Kernel Parameters - Ulimit6- To improve performance, how can you safely set the limit of processes for the super-user root to be unlimited?7- Where can you set the resource limits for users logged in via PAM?8- How to check ulimit for a user?9- How to check and increase the limit of opened files in Linux?10- How to view run time kernel parameters?11- How to change runtime kernel parameter for maximum shared segment size in bytes?12- How to view Boot time parameters and which file is modified to change these parameters?Linux system Troubleshooting - Part 3Troubleshooting with uptime lsof pidof sar and more13- How to check system load without top command?14- By default load average is shown in how many intervals?15- How can you get the physical and virtual memory statistics?16- How to check cpu utilization and other statistics?17- How to find process id of a process and kill it immediatley?18- How to list all open files by specified user?19- How to list all open files by specified command?20- How can you list all network connections by port 22?Advanced Linux system administrations questions and answers:1- Run a command that shows all lines except any lines starting with the a character "#" in a file?2- How can you continuously monitor log files for errors?3- How to automatically remove files older than 7 days by creating a cron job to run every night?4- How to list/print all created users on the system and send(redirect) them to a file?5- How would you list only the 2nd column from a file?6- How to broadcast a message to all logged -in users?7- How to create a user with no login access?8- How to schedule a server reboot in 15 minutes?9- How to find disk usage by the largest directories?10- How to prevent users from deleting other users files in a directory?11- How to display 10th line of a file only?12- Your server got hacked. Due to the amount of damage, the whole server needs to be restored. How would you go about doing that?13- What necessary steps should be taken to enhance the security of a server after the initial install?14- Which file is the most commonly known to check for log messages?15- How and why to disable ping?16- Explain the different fields in /etc/passwd?17- Which cammand can tell how long the system has been running?18- How to check if a port is listening?19- You got a ticket stating server is down, how would you troubleshoot?20- How to find all files in /bin with specified(755) permissions?Part 2: 1- What is the default port & configuration file of SSH Server ?2- How to change the default ssh port in linux ?3- How to change Maximum allowed sessions through SSH?4- What is the configuration file of ssh client ?5- How to disable SSH root login in linux server ?6- How to allow only specific users to ssh your linux server ?7- SCP and how its used?8- How to check SSH server's Version ?9- How to setup password less ssh authentication in Linux?Part 3: 1- How to extend SWAP space?2- How to extend a logical volume?3- How to create a logical volume?4- How to create a volume group?5- How to create a physical volume after the disk space has been added?6- Is it possible to increase the logical volume on the fly?7- How to reduce the logical volume and is it possible to reduce it on the fly?8-9- How to scan disks for existing volume group and how to scan a logical volume from existing volume group?10-11-12-13- How to activate, deactivate, disable/enable a logical volume and a volume group? How to activated the logical volume which in deactivated state? How to disable the volume group ? or Deactivate the volume group? How to enable the volume group ? or Activate the volume group?14- What is the default size of a physical extent in LVM?15-16-17- How to list the available logical, physical volumes and see detailed volume group info on the system?How to list the available physical volumes in LVM?How to see the detailed volume group information?Part 4: 1- How to find files that are over 10MB in size?2- How would would you run a command that shows all lines containing a character # in a file?3- How would you display all lines of a file with line numbers?4- How to find current system information such as the version or release info of your server?5- Where are the files located for network interfaces?6- Which command can you run to find if a certain package has been installed?7- How to find out total lines in a file without opening that file?8- How to find disk usage by the largest directories?9- How to find all directories named conf under root?10- How to find files not accessed in over 3 days?11- How to view difference between 2 files?12- What is the location of system configuration files that should be backed up regularly?13- What is the command to view all the currently logged in users?Linux system administration Q&A1- Which 2 files contain default values when creating a user with useradd command?Questions 2-8 covered in one lecture: 2- What is the command to create a user with a pre defined uid, shell and home directory?3- How to delete a user with his home directory?4- How to create a user specifying a primary/Secondary grp?5- How to change primary group for any user?6- How can you give a normal user all the root level privileges?7- How can you give sudo access to any user without asking him to provide password every time he runs a command?7- How to view the User's login and logout details?8- How to lock & unlock the User Account ?Questions 9-14 covered in one lecture: 9- What is the command to view and change the expiry date for any user?10- What are the fields of /etc/passwd file?11- What is the difference between .bash_profile and .bashrc?12- What are the details you get with finger command?13- Name 3 files which are automatically created inside any user's home directory when a user is added?14- What is the command to view all the currently logged in users?Linux basic system administration questions and answers: 1- Which 2 files contain the default values when creating a user with useradd command?Questions 2-8 covered in part 2: 2- What is the command to create a user with a pre defined uid, shell and home directory?3- How to delete a user with his home directory?4- How to create a user specifying a primary/Secondary grp?5- How to change primary group for any user?6- How can you give a normal user all the root level privileges?7- How can you give sudo access to any user without asking him to provide password every time he runs a command?7- How to view the User's login and logout details?8- How to lock & unlock the User Account ?Questions 9-14 covered in part 3: 9- What is the command to view and change the expiry date for any user?10- What are the fields of /etc/passwd file?11- What is the difference between .bash_profile and .bashrc?12- What are the details you get with finger command?13- Name 3 files which are automatically created inside any user's home directory when a user is added?14- What is the command to view all the currently logged in users?Linux Basic Technical questions and answers How to display hidden files?Whats the difference between $ and # prompts on CLI?How to find an error in a file?
How to make a directory?
How to remove a directory?
How to create a file?
How to move a file?
How to delete a file?
What is the default port # for DNS
What is the DNS package name?
what is the configuration file for DNS and its location?
List 3 types of file system?
List any 4 Linux flavors?
How to log off from Linux system?
How to check if a package is installed?
How to check your previously typed in commands?
Where are zone files located for DNS?
What is the command to find your current directory?
How to check file permissions?
How to find file type of a file?
How to find where passwd command is located?
what command is used for changing file permissions?
What command is used to read top/bottom part of a file?
How to check mtu, ip and MAC address?
How to get help on certain commands?
How to find your host name?
How to count total lines of a file?
What is the command to create a group?
How to reboot a Linux machine with init command?
Where are the user passwords saved?
How to find running processes on your system?
where is the network time configuration file located?
When is the last command used?Student suggested Videos19 new Lectures added to student suggested videos Section: Boot Process RHEL/CentOS 6 and 7 19:35 minutesRun Levels 5:41 minutesTargets 9:05 minutesNIC Bonding 10:00 minutesWhat are Linux Distributions? 6:47 minutesWhat are the advantages of using Linux? 7:14 minutesWhat is Linux? 7:18 minutesWhat is a virtual environment or virtualization? 10:09 minutesHow to download and install Oracle Virtual Box? 3:04 minutesHow to download and install Redhat Linux? 17:17 minutesHow to download, install and connect through putty? 7:28 minutesWhat are different ways of accessing a Linux Server? 5:44 minutesWhat is absolute vs relative Path? 9:53 minutesHow to Count Words, Lines and Characters in a file? 6:44 minutesHow to display and set the server's Hostname? 7:04 minutesExplain vi editor basics? 12:20 minutesHow to list and modify System Timezone? 3:55 minutesHow to find help within Linux? 12:50 minutesHow to compress and archive files? 16:59 minutesNew Section added: "Directory structure, Files, directories, permissions and more" 14 new lectures added:Explain Linux Directory Structure 27:35 minutesWhat are the common file types used in Linux? 13:01 minutesHow to create files and directories? 10:19 minutesHow to list files and directories? 7:25 minutesHow to display File Contents with cat, less, more and tail? 12:04 minutesHow to copy directories and files? 5:31 minutesHow to move or rename directories and files? 4:31 minutesHow to remove directories and files? 10:11 minutesWhat are the file and directory control Attributes? 13:34 minutesBasics of File and Directory Permissions 8:07 minutesHow to modify file permissions? 13:12 minutesExplain default permissions and umask? 10:50 minutesHow to modify file ownership and group membership? 9:14 minutesWhat are special permissions: setuid, setgid and sticky bit? 30:03 minutes

Overview
Section 1: Part 1: Before the Interview
Lecture 1 Introduction
Lecture 2 Call with Recruiter
Lecture 3 Research the Company
Lecture 4 Understand the Job Requirement
Lecture 5 Know Your Resume
Lecture 6 Interview Format
Section 2: About Yourself
Lecture 7 Tell me about yourself
Section 3: Behavioral Interview Questions
Lecture 8 Behavioral Interview Questions
Lecture 9 What is you biggest achievement at this point in your life?
Lecture 10 How do you handle difficult situation?
Lecture 11 Discribe a time you disagreed with your supervisor?
Lecture 12 Where do you see yourself in 5 years
Lecture 13 What is your weakness?
Section 4: Technical Interview Questions
Lecture 14 Technical Interview Example
Lecture 15 What is the purpose of having different network ports?
Lecture 16 What are the fields in /etc/passwd file?
Lecture 17 Explain cron job syntax?
Lecture 18 Walk me through the Linux boot process?
Lecture 19 Explain the difference between RAID0, RAID1 and RAID5?
Lecture 20 Walk me through the proecss of NIC bonding?
Lecture 21 How would you go about installing and conifgurationhttp server?
Lecture 22 What is DNS. Explain each DNS record?
Lecture 23 Process it taking 100% CPU, how to troubleshoot?
Lecture 24 How to scan a new storage in Linux without system reboot?
Lecture 25 How to assign permission to only ONE user?
Section 5: Scenario or Situational Based Questions
Lecture 26 Scenario Based Questions
Lecture 27 How to troubleshoot disk space issues?
Lecture 28 What could be the issue if you can ping a server by IP but not by hostname?
Lecture 29 You get a call that a user cannot reach a server, how would you troubleshoot?
Lecture 30 How to troubleshoot if a website running on your server is down?
Lecture 31 You are notified that a server is down, how to troubleshoot?
Lecture 32 How to handle situation when your DBA is asking for more memory/disk frequently?
Lecture 33 What is your experience on shell scripting. Provide some examples?
Lecture 34 What are the different types of run-levels?
Lecture 35 You get a call that a server is running slow, how would you troubleshoot?
Lecture 36 Walk me through the process of recovering root password?
Section 6: 2nd Part - In Depth Technical Interview Questions
Lecture 37 Example 1
Lecture 38 Example 2
Section 7: Linux basic interview system administration QnA
Lecture 39 Part 1- Linux basic system administration questions and answers
Lecture 40 Part 2- Linux basic system administration questions and answers
Lecture 41 Part 3- Linux basic system administration questions and answers
Section 8: Linux Basic Technical questions and answers
Lecture 42 Linux Basic Technical questions and answers
Section 9: Linux interview system troubleshooting QnA
Lecture 43 Linux system Troubleshooting - Part 1
Lecture 44 Linux system Troubleshooting - Part 2
Lecture 45 Linux system Troubleshooting - Part 3
Section 10: Part 1- Advanced Linux system administrations questions and answers
Lecture 46 1- show all lines except any lines starting with the a character # in a file
Lecture 47 2-How can you continuously monitor log files for errors?
Lecture 48 3- Find and remove files older than 7 days through cron job.
Lecture 49 4- Find, print, users on the system and redirect to a file
Lecture 50 5- How would you get only the 2nd column from a file?
Lecture 51 6- Broadcast a message to users
Lecture 52 7- User with no login access
Lecture 53 8- Schedule a server reboot in 15 minutes
Lecture 54 9- Disk usage
Lecture 55 10- Stickybit
Lecture 56 11- Print 10th line of a file only.
Lecture 57 12- Restore a hacked Server
Lecture 58 13- Server security
Lecture 59 14- Log messages
Lecture 60 15- ICMP disable
Lecture 61 16- Explain fields in /etc/passwd file
Lecture 62 17- System uptime
Lecture 63 18- Listening Ports
Lecture 64 19- Server down troubleshooting
Lecture 65 20- Find files with specific permissions
Section 11: Part 2- Advanced Linux system administrations questions and answers
Lecture 66 Lecture 1
Lecture 67 Lecture 2
Section 12: Part 3- Advanced Linux system administrations questions and answers
Lecture 68 1- Extend SWAP space
Lecture 69 2- Extend a logical volume
Lecture 70 3- Create a logical volume
Lecture 71 4- Create a volume group
Lecture 72 5- Create a physical volume
Lecture 73 6- Increase logical volume on the fly
Lecture 74 7- Reduce the logical volume
Lecture 75 8 -9- Scanning volume group and logical volume
Lecture 76 10-13 - Activating and deactivating LV and VG
Lecture 77 14- Physical Extent in LVM
Lecture 78 15-17- Finding Info and details in LVM
Section 13: Part 4- Advanced Linux system administrations questions and answers
Lecture 79 1- Find files that are over 10MB in size
Lecture 80 2- Show lines only containing #
Lecture 81 3- File lines with numbers
Lecture 82 4- Server version and release
Lecture 83 5- Network Interface files
Lecture 84 6- Installed software Packages
Lecture 85 7- Line count
Lecture 86 8- How to find disk usage by the largest directories
Lecture 87 9- How to find all directories named .conf under root
Lecture 88 10- How to find files not accessed in over 3 days
Lecture 89 11- How to view the differences between two different files?
Lecture 90 12- Which system configuration files should be backed up regularly?
Lecture 91 13- What is the command to view all currently logged in users?
Section 14: Real Life Interview Questions and Answers
Lecture 92 Boot Process RHEL/CentOS 6 and 7
Lecture 93 Run Levels
Lecture 94 Targets
Lecture 95 NIC Bonding
Lecture 96 What are Linux Distributions?
Lecture 97 What are the advantages of using Linux?
Lecture 98 What is Linux?
Lecture 99 What is a virtual environment or virtualization?
Lecture 100 How to download and install Oracle Virtual Box?
Lecture 101 How to download and install Redhat Linux?
Lecture 102 How to download, install and connect through putty?
Lecture 103 What are different ways of accessing a Linux Server?
Lecture 104 What is absolute vs relative Path?
Lecture 105 How to Count Words, Lines and Characters in a file?
Lecture 106 How to display and set the server's Hostname?
Lecture 107 Explain vi editor basics?
Lecture 108 How to list and modify System Timezone?
Lecture 109 How to find help within Linux?
Lecture 110 How to compress and archive files?
Section 15: EXTRAS: Directory structure, Files, directories, permissions and more
Lecture 111 Explain Linux Directory Structure
Lecture 112 What are the common file types used in Linux?
Lecture 113 How to create files and directories?
Lecture 114 How to list files and directories?
Lecture 115 How to display File Contents with cat, less, more and tail?
Lecture 116 How to copy directories and files?
Lecture 117 How to move or rename directories and files?
Lecture 118 How to remove directories and files?
Lecture 119 What are the file and directory control Attributes?
Lecture 120 Basics of File and Directory Permissions
Lecture 121 How to modify file permissions?
Lecture 122 Explain default permissions and umask?
Lecture 123 How to modify file ownership and group membership?
Lecture 124 What are special permissions: setuid, setgid and sticky bit?
Lecture 125 Linux Server Security
Lecture 126 Firewall and iptables
Lecture 127 Understanding Processes
Lecture 128 Viewing and Monitoring Processes
Lecture 129 Listing a Specific process
Lecture 130 View Processes by User and group ownership
Lecture 131 Process States
Lecture 132 What is process Niceness
Lecture 133 Viewing and Changing Process Niceness
Lecture 134 Renicing a Running Process
Lecture 135 Control Processes with signals
Lecture 136 Job Scheduling
Lecture 137 Controlling user access
Lecture 138 Scheduler Log File
Lecture 139 Scheduling with at command
Lecture 140 Submit, view, list and remove an at job
Lecture 141 Using crontab
Lecture 142 Syntax of User Crontab Files
Lecture 143 Add list and remove a Cron job
Lecture 144 Congratulations
Section 16: Welcome to Bonus Section
Lecture 145 Welcome to Bonus Section
Lecture 146 Bonus video
Anyone with a desire to pursue Linux as a career.,Current Linux support professionals who would like to level up their career.,Advanced Linux professionals who would like to brush up on their Technical Interview questions.,IT Managers who would like to ask better questions in a Technical Linux interview.

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