Top 100 Linux Interview Questions
Q:1 What is the boot sequence of a linux server ?
Q:2 What is Hard disk driver or Hard disk module, are they different or same. Explain.
Q:3 How you will get the WWN number of HBA card installed in Linux
Q:4 How to check RHEL Version ?
Q:5 What is network bonding and different levels of bonding ?
Q:6 How to share a linux resource on windows machine ?
Q:7 How to scan newly assigned SAN’S LUN on Linux server without rebooting ?
Q:8 How to reset grub passwd and root passwd in linux ?
Q:9 What is journaling in linux ?
Q:10 What is difference between ext2 & ext3 and ext4 file system ?
Q:11 What are the steps to create LVM of newly created LUN ?
Q:12 How to see the tape device name in linux ?
Q:12 Power path Overview with software/driver installation on Linux servers ?
Q:13 What is RAID & different types of RAID levels ?
Q:14 What are the default ports used for smtp , ftp, ssh & samba ?
Q:15 How to calculate free size from free PE mentioned in VG Display ?
Q:16 LVM initialize on which stage in boot sequence ?
Q:17 What Grub and its different stages ?
Q:18 If we have a File data.txt, How you will give permission as below
Group Name – finance, write only
Users – tom & jack only read
Users – bond , read write execute.
Q:19 How to change network interface name ifcfg-eth0 to ifcfg-nic0
Q:20 How to re-size the file system ?
Q:21 How to preserve the permission on tar backup ?
Q:22 How to set default gateway in different ways ?
Q:24 How to work in 2 different files with vi editor, How to copy paste & cut in multiple files ?
Q:25 Difference between tar,cpio & dd backup ?
Q:26 How to increase size of swap in linux ?
Q:27 How to run a particular script in runlevel 3 ?
Q:28 What is meaning of “no_root_squash” in nfs ?
Q:29 What daemons run on nfs client ?
Q:30 How to check what are the driver installed in system ?
Q:31 What is the format /etc/fstab file ?
Q:32 From where the command ‘rpm -qa’ find the installed packages ?
Q:33 What is the function of syslog ?
Q:34 How you check the bottle neck of slow server ?
Q:35 What is the basic format of NFS mount ?
Q:36 Differnce b/w automount FS and NFS
Q:37 What is the role of boot loader(GRUB) Stage 1.5 ?
Q:38 Difference between super block and data block ?
Q:39 How to check the version of package ?
Q:40 What is Set UID and GID ?
Q:41 What is sticky bit and where to use ?
Q:42 Difference between LVM1 and LVM2 ?
Q:43 What is role of $0, $? and $# in shell scripting ?
Q:44 How to find the MX record of a domain from the command line ?
Q:45 What is the limitation of fdisk command & where to use parted command ?
Q:46 What are Logical steps for PXE Server setup in linux ?
Q:47 What is the role of %pre & %post in kickstart ?
Q:48 What are the different fields of crontab file & cron log file ?
Q:49 what is the difference between -U & -F option in rpm command ?
Q:50 How will supply/Reset password for 50 user without typing password again & again ?
Q:51 How will you get Module / Driver Information in linux ?
Q:52 How to check active ports in linux ?
Q:53 What is difference between sar and vmstat ?
Q:54 is it possible to boot the system without /boot partition OR deleted /boot partition ?
Q:55 How to change the complexity of password ?
Q:56 How to resolve if authentication failure (incorrect password ) ?
Q:57 How to change run level with in linux ?
Q:58 How will you load PAM module ?
Q:59 Is there a way to check the current system kernel for 32-bit kernel vs. 64-bit kernel?
Q:60 which file is responsible for forwarding (DNS) and what’s meaning of MX,PTR record ?
Q:61 What are Zombie process and how to check Zombie Processes ?
Q:62 How will you differentiate defunct and running processes in linux ?
Q:63 How to run job in background ?
Q:64 What is anacron & where to use anacron ?
Q:65 What is the role and size of MBR ?
Q:66 How to set grub boot loader password ?
Q:67 How to set the date in IST FORMAT from the command line ?
Q:68 How to check nfs version and release ?
Q:69 what is static and dynamic route in linux ?
Q:70 How to check whether oracle is installed or not in unix ?
Q:71 How to check which nfs share is mounted ?
Q:72 How to mount ISO file in linux ?
Q:73 what is LDS certificate ?
Q:74 How will you patch older kernel version in Linux machine ?
Q:75 What is the difference between yast & yast2 command ?
Q:76 How will you deactivate mouse in RHEL and which service is resposible for that ?
Q:77 What is ssh port forwarding ?
Q:78 How to patch linux servers using spacewalk ?
Q:79 What is the difference between RHN and Spacewalk ?
Q:80 How to recover deleted LVM partitions in linux ?
Q:81 How will you use trap and shift command in unix ?
Q:82 What are different components of Postfix Mail Server ?
Q:83 What is the use of SPF record & Domain Keys in mail server ?
Q:84 What is difference between NFS3 & NFS4 ?
Q:85 What is use of lsof command ?
Q:86 How will you check last week accessed files ?
Q:87 what is the use of ‘exec’ & ‘ok’ option in find command ?
Q:88 Give one exmaple of suid, sgid and Sticky bit ?
Q:89 How to reset failed login counts in linux ?
Q:90 What is the use of .netrc file in linux ?
Q:91 How to integrate Linux Servers with Microsoft Active Directory ?
Q:92 What is use of xargs with find command ?
Q:93 What are the different states of a process in linux/unix ?
Q:94 What is the use of ACLs in linux and how to implement ACLs ?
Q:95 What is the difference between useradd and adduser ?
Q:96 What is LVM Snapshot and use of lvm snapshot ?
Q:97 How to check yum repositry information & clear yum cache in linux ?
Q:98 How to create yum repository locally ?
Q:99 What is the role fencing in redhat cluster ?
Q:100 How to gracefully shutdown two node linux cluster in case of planned power outage ?