20 Linux System Admin Interview Questions For Beginners – Part 1
In this tutorial we will discuss most frequently asked linux system admin interview questions for Beginners. Below are the list of L1 level linux interview questions..
Q:1 How To check the uptime of a Linux Server ?
Ans: Using uptime command we can determine how long a linux box has been running , also uptime can be viewed by the top & w command.
Q:2 How to check which Redhat version is installed on Server ?
Ans: Use the command cat /etc/redhat-release , output of this command will tell you the redhat version.
Q:3 How to install rpm packages in Redhat & CentOS linux ?
Ans: rpm and yum command are used to install packages in redhat linux and CentOS.
Q:4 How to check the ip address of LAN Card ?
Ans: Using ‘ifconfig’ & ‘ip address’ command we can determine the ip address of LAN Card.
Q:5 How to determine the hostname of a linux box ?
Ans: On typing the hostname command on terminal we can determine the hostname of a linux server.
Q:6 How To check the default gatway ?
Ans: Using ‘route -n’ command we can determine the default gateway in linux.
Q:7 Which Command is used to check the kernel Version ?
Ans: ‘uname -r’
Q:8 How to check the current runlevel of a linux box ?
Ans : ‘who -r’ and ‘runlevel’ , both of these command are used to find current run level.
Q:9 What is Initrd ?
Ans: Initrd stands for initial ram disk , which contains the temporary root filesystem and neccessary modules which helps in mounting the real root filesystem in read mode only.
Q:10 What is Bootloader ?
Ans: Bootloader is a program that boots the operating system and decides from which kernel OS will boot.
Q:11 How to list hidden files from the command line ?
Ans: ‘ls -a’ <Folder_Name>
Q:12 What is soft link ?
Ans: Soft link is a method to create short cuts in linux. It is similar to windows short cut feature.
Q:13 How to create a blank file in linux from command line ?
Ans: Using the command ‘touch <file-name>’
Q:14 What is run level 2 ?
Ans: Run level 2 is the multi-user mode without networking.
Q:15 Why linux is called OpenSource ?
Ans: Because One can customize the existing code and can redistribute it.
Q:16 How to check all the installed Kernel modules ?
Ans: Using the Command ‘lsmod’ we can see the installed kernel modules.
Q:17 What is the default uid & gid of root user ?
Ans: Default uid & gid of root user is 0.
Q:18 How To change the password of user from the Command Line ?
Ans: ‘passwd <User-Name>’
Q:19 What is a Process ?
Ans: Any program in execution is called a process.
Q:20 What is name of first process in linux ?
Ans: ‘init’ is the first process in linux which is started by kernel and whose pid is 1.