Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution.
Here is the list of top 99 Linux interview question
- Which file is responsible for forwarding (dns) and what’s meaning of MX,ptr record?
- What is use of xargs with find command?
- What is use of lsof command?
- What is the use of spf record & domain keys in mail server?
- What is the use of acls in linux and how to implement acls?
- What is the use of ‘exec’ & ‘ok’ option in find command?
- What is the use of .netrc file in linux?
- What is the term “network bonding” and what are different levels of bonding?
- What is the role of boot loader(grub)?
- What is the role of %pre & %post in kickstart?
- What is the role fencing in redhat cluster?
- What is the role and size of mbr?
- What is the process to scan newly assigned san’s lun on linux server without rebooting?
- What is the process to create logical volume manager (LVM) of newly created LUN?
- What is the main boot sequence of a linux server?
- What is the limitation of fdisk command & where to use parted command?
- What is the function of syslog?
- What is the format of /etc/fstab file?
- What is the difference between yast & yast2 command?
- What is the difference between useradd and adduser?
- What is the difference between -u & -f option in rpm command?
- What is the difference between rhn and spacewalk?
- What is the basic format of nfs mount?
- What is sticky bit and where to use?
- What is static and dynamic route in Linux?
- What is ssh port forwarding?
- What is set uid and gid?
- What is role of $0, $? And $# in shell scripting?
- What is raid & what are different types of raid levels?
- What is power path overview with software/driver installation on linux servers?
- What is meaning of “no_root_squash” in nfs ?
- What is lvm snapshot and use of lvm snapshot?
- What is lds certificate?
- What is journaling in linux ?
- What is hard disk driver or hard disk module, what is the difference between both. Explain.
- What is grub and what are its different stages?
- What is difference between sar and vmstat?
- What is difference between nfs3 & nfs4?
- What is anacron and where we can use anacron?
- What daemons need to run for nfs client?
- What are zombie processes and how to check zombie processes?
- What are the different states of a process in linux/unix?
- What are the different fields of crontab file & cron log file?
- What are the default ports used for smtp, ftp, ssh & samba service?
- What are logical steps for pxe server setup in linux?
- What are different types of file system in linux difference and what is the difference between ext2 & ext3 and ext4 file system?
- What are different components of postfix mail server?
- Is there a way to check the current system kernel for 32-bit kernel vs. 64-bit kernel?
- Is it possible to boot the system without /boot partition or deleted /boot partition?
- In linux boot sequence lvm initialize is happen on which stage?
- How you check the bottle neck of slow server ?
- How will you use trap and shift command in unix ?
- How will you patch older kernel version in linux machine ?
- How will you load pam module in linux machine?
- How will you get module / driver information in linux ?
- How will you differentiate defunct and running processes in linux ?
- How will you deactivate mouse in rhel and which service is resposible for that ?
- How will you check last week accessed files ?
- How will supply/reset password for 50 user without typing password again & again ?
- How we can get get the wwn number of hba card installed in linux
- How to work in 2 different files with vi editor, how to copy paste & cut in multiple files ?
- How to share a linux resource or storage on microsoft windows machine?
- How to set the date in ist format from the command line ?
- How to set grub boot loader password ?
- How to set default gateway in different ways ?
- How to run job in background ?
- How to run a particular script in runlevel 3 ?
- How to resolve if authentication failure (incorrect password ) ?
- How to re-size the file system ?
- How to reset the grub password and root password in linux ?
- How to reset failed login counts in linux ?
- How to recover deleted lvm partitions in linux ?
- How to preserve the permission on tar backup ?
- How to patch linux servers using spacewalk ?
- How to mount iso file in linux ?
- How to integrate linux servers with microsoft active directory ?
- How to increase size of swap in linux ?
- How to gracefully shutdown two node linux cluster in case of planned power outage ?
- How to find the tape device name in linux ?
- How to find the mx record of a domain from the command line ?
- How to create yum repository locally ?
- How to check yum repositry information & clear yum cache in linux ?
- How to check which nfs share is mounted ?
- How to check whether oracle is installed or not in unix ?
- How to check what are the driver installed in system ?
- How to check the version of package ?
- How to check nfs version and release ?
- How to check active ports in linux ?
- How to change the complexity of password ?
- How to change run level with in linux ?
- How to change network interface name ifcfg-eth0 to ifcfg-nic0
- How to calculate free size from free pe mentioned in vg display ?
- Give one exmaple of suid, sgid and sticky bit ?
- From where the command ‘rpm -qa’ find the installed packages ?
- Differnce b/w automount fs and nfs
- Difference between tar,cpio & dd backup ?
- Difference between super block and data block ?
- Difference between lvm1 and lvm2 ?
- If we have a file info.txt, how you will give permission as below : Group name – admin, write only, Users – tom & jerry only read
users – sany , read write execute.