Linux Technical Interview Questions Part-1
1. When you login you get “$” prompt, what is the prompt for root?
#
2. Explain the difference between grep and egrep?
Search online
3. What is the port # for DNS, NTP and NFS?
53,123 and 111/2049
4. What is the configuration file name of DNS and where is it
located?
/etc/named.conf
5. How many new directories will be created after running the
following command
mkdir {a..c}{1..3}
9
6. Your PC is configured with a DNS server address but not the
default gateway. Can the PC access internet?
No
7. What is the difference between IP and Gateway?
Search online
8. Can you assign one static IP to 2 computers, if not then why?
No because it will create IP conflict
9. How to change IPs address to static?
ifconfig x.x.x.x
10. You are trying to ping a server by hostname and you get an error
message, “ping: unknown host …”. What could be the reason and
how to solve the problem so you can ping it by hostname?
Check for /etc/hosts or DNS to see if it has hostname to IP entry
11. Explain the difference between relative and absolute path?
Absolute path starts from / where relative path is your current
directory
12. List 3 different methods of adding user?
Search online
13. What is the command to change file/directory ownership and group?
chown and chgrp
14. List any 3 type of filesystem?
ext4,NTFS and FAT
15. When you login you get a message on the screen. What is the name
of that file and where is it located?
/etc/motd
16. What is /bin directory used for?
Search online
17. What are the different types of DNS Server
Master and secondary
18. How to change a user password?
passwd username
19. What is the version of Redhat Linux you have experience with?
7.4
20. List any 4 linux distributions?
Redhat, CentOS, Ubuntu and SUSE
21. How to logoff from the system?
exit
22. Give any 3 examples of operating systems?
Windows, Linux and MAC
23. How to create a directory?
mkdir
24. Where are the zone files located for DNS service?
/var/named/zonefiles
25. How to check kernel version?
uname –a
26. Which directory has all the configuration files?
/etc
27. How to become root user from a regular user?
su –
28. How many mega bytes in 1 giga bytes?
Search online
29. What is the purpose of having different network ports?
So the communication of each application goes through a dedicated
port
30. How to display first column of a file?
cat filename | awk ‘{print $1}’
31. What is the name of DNS rpm package?
bind
32. What is the difference between nslookup and dig commands?
Search online
33. How to check your user id and group id?
id
34. How to check a file’s permission?
ls –l
35. What is the difference between “kill” and “kill -9” command?
Search online
36. What is subnet?
Search online
37. You are troubleshooting an issue with Redhat support and they
have asked you to send the contents of /etc directory. How and
which method you will use to transfer the contents?
tar (compress) the entire /etc directory and ftp
38. What is root home directory?
/root
39. What is rsyslogd deamon and its purpose?
Search online
40. Your company has terminated a server administrator. What is first
thing as an administrator you should do to enhance the security?
Change root password
41. How to check the computer name or host name in Linux?
hostname
42. Which permission allows a user to run an executable with the
permissions of the owner of that file?
First 3 bits should have x
43. What is the command to untar a tarred file?
untar
44. What is /proc directory used for?
Search online
45. What is the purpose of nsswitch.conf file
It tells the system where to go to resolve hostnames
46. List 3 basic commands to navigate the filesystem?
cd, pwd and ls
47. Which service/daemon should be running on the server that allows
you to connect remotely?
sshd
48. What is the purpose of firewall?
Search online
49. List any 3 IT components?
Hardware, OS and Applications
50. Which directory has all the commands we use, e.g. ls, cd etc.?
/usr/bin or /bin
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