Linux Technical Interview QA with Practical Sessions




Linux Technical Interview QA with Practical Sessions

                            LINUX Basic Course Outline

Here are topic wise Linux System Administrator Interview Questions …

Interview Questions on topic User Administration in Linux

  • What the fields of /etc/passwd file?
  • How to create a user with specifying a primary/Secondary grp?
  • How can you create a user without useradd command?
  • What is the default permission on user's home directory?
  • What is the difference between .bash_profile and .bashrc?
  • What is the command to create a user with a pre defined uid, shell and home directory?
  • How to change primary group for any user?
  • If I delete a user, does it's home directory gets deleted? If not then what is the command to delete the home directory of user along with the user
  • Name any 3 files which are automatically created inside any user's home directory when a user is added.
  • What is the command to view all the currently logged in users?
  • What is the command to change and view the expiry date for any user?
  • What are the details you get with finger command?
  • How can you give a normal user all the root level privileges?
  • Name any 3 groups of which root is a member by default
  • How can you give sudo access to any user without asking him to provide passord every time he runs a command?
  • Why should I use visudo command instead of directly editing the file with vi or any other editor?
  • Default permission of file and Directory ?
  • How to view the User's login and logout details ?
  • How to check Primary and Secondary Group of One User ?
  • How to lock & unlock the User Account ?

Interview Questions on topic permissions in Linux

  • What is the difference between SUID and SGID?
  • What is Sticky Bit permission?
  • What is umask?
  • What is the default umask value for useradd command and where is it defined?
  • Will you be able to cd into a directory with only read permission?
  • What is -R argument used for along with chmod command?
  • How can you restrict a normal as well as root user from making any changes as well as deleting any file?
  • What is the difference between small t and capital T when applying sticky bit permission?
  • List out few of the differences between Softlink and Hardlink?
  • What is the difference between umask and ulimit ?

Interview Questions on topic LVM in LINUX

  • How many volume groups can be created in Linux ?
  • Is it possible to increase the logical volume on fly ?
  • How to reduce the logical volume ? is it possible to reduce on fly ?
  • How to increase the logical volume?
  • How to do you scan the new LUN or disk for LVM  physical volume ?
  • How to scan disks for existing volume group ?
  • How to scan a logical volume from existing volume group?
  • How to stop the logical volume ? or deactivate the logical volume ?
  • 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 ?
  • How do you find that what are the disks are used for  logical volume mirroring ?
  • How to list the imported volume groups ?
  • How to list the available logical volumes on the system?
  • How to list the available physical volumes in LVM?
  • How to see the detailed volume group information ?

Interview Questions on topic Linux Boot Process

  • Explain booting process ?
  • Define BIOS, MBR?
  • Explain GRUB and how it differs from latest GRUB2?
  • How would you define initramfs and what is its function in the Linux booting process?
  • What is the one new feature of RHEL 7?
  • What is systemd? And tell few features of systemd which makes it differs from other OS.
  • Overview of Systemd in RHEL 7?
  • List few features of Systemd? And tell few features of systemd which makes it differs from other OS.
  • Booting process of RHEL 7?
  • When it is required to boot the Linux box in to rescue mode and how we can boot it on rescue mode?
  • What is the command to change the runlevel in RHEL 7? and also to view what targets are available you can issue the list-units option with the type target?
  • Rescue mode in RHEL7 & how can we boot into Rescue mode?
  • What is basic difference between Rescue & Emergency Mode?
  • How can we recover MBR if it gets corrupted?
  • Suppose someone accidently deleted the mount binary i.e. (/bin/mount) and rebooted the Linux Box, then how would recover your box from this situation?

Interview Questions on topic SSH in LINUX

  • What is the default port & configuration file of SSH Server ?
  • How to change the default ssh port in linux ?
  • What is the configuration file of ssh client ?
  • How to disable the root login in linux server ?
  • How to allow only specific users to ssh your linux server ?
  • How to enable debugging in ssh command ?
  • What is the difference between ssh & Telnet ?
  • What is use of sshpass command in linux ?
  • What is the use of scp command ?
  • What is the use of blowfish options in scp command ?
  • How to limit the bandwidth used by scp command ?
  • How to enable passwordless ssh authentication in Linux ?
  • How to check SSH server’s Version ?
  • How to Copy the file “server.txt” from the local machine to a remote host using port 2751 in /opt folder.

Technical Interview QA on Process Management

  • What is a prcoess and whats the command to list all the process?
  • How to use custom properties while running a ps command?
  • What is PID & PPID ? Example with an example?
  • What is a nice value & how can we set it for a process?
  • What is 'D Uninterruptible sleep mode?
  • What is Z and paging Stat process stats?



Learn Interview tips from IT professionals with live Environment Sessions.

Url: View Details

What you will learn
  • LINUX Technical Interview QA’s with Practical way of explanation
  • Interview Questions on topic User Administration in Linux
  • Interview Questions on topic Permissions Administration in Linux

Rating: 4.45

Level: Beginner Level

Duration: 5.5 hours

Instructor: Shikhar Verma • 60k+ Students Worldwide


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