Linux Technical Query!

Hello Everyone, I am a new one on this site. I just want to know the most important questions of Linux. My interview has been scheduled for next to next week. If anyone helps me please suggest some tricks and tips. I have already prepared to some topics like basic components of Linux, BASH and DOS, daemons, swap space in Linux and some more.

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nisti2

And what's your background and the position that you are applying for?

rohanjoshi0894

Hi,
Might be he is asking for Linux Administration Jobs, Here I am listing a few questions through you can make preparation for Linux Interview Questions:

Q: Can you tell us about the basic components of Linux?
Q: Please draw a comparison between BASH and DOS.
Q: How will you check out how much memory Linux is using?
Q: How will you check out how much memory Linux is using?
Q: Can you tell us about the various kinds of permission under Linux? Also, explain how to change permissions.
Q: Please explain the virtual desktop and how to share a program across different virtual desktops under Linux.
Q: What do you understand by daemons?
Q: Please explain the various modes when using vi editor.
Q: What are the contents of /usr/local?
Q: Tell us how you will execute more than one command or program from a single command line entry.
Q: What do you mean by hard links in Linux?
Q: Please explain case-sensitivity issues in Linux.
Q: Can you tell what does a nameless directory represent in Linux?
Q: Can you draw the Linux architecture?
Q: Please explain how to enable curl on Ubuntu LAMP stack and root logging in Ubuntu?
Q: How will you append one file to another in Linux?
Q: What command would you use for editing, searching, and replacing text in Linux?
Q: What do you understand by swap space in Linux?
Q: Please explain how you will run a Linux program in the background together with starting the Linux Server.
Q: Can you explain how to remote login with SSH?
Q: Please explain checking for Rootkit infections in Linux.
Q: How will you setup Password Aging in Linux?

rohanjoshi0894

Hi Ankit,

here I am sharing with you some basic Linux command:

$ man command-name

adduser/addgroup Command

$ sudo adduser tecmint

agetty Command

$ agetty -L 9600 ttyS1 vt100

alias Command

$ alias home='cd /home/tecmint/public_html'

anacron Command

apropos Command

$ apropos adduser

apt Command

$ sudo apt update

apt-get Command

$ sudo apt-get update

aptitude Command

$ sudo aptitude update

arch Command

$ arch

arp Command

$ sudo arp-scan --interface=enp2s0 --localnet

at Command

$ sudo echo "shutdown -h now" | at -m 23:55

atq Command

$ atq

atrm Command

$ atrm 2

awk Command

$ awk '//{print}'/etc/hosts

batch Command

basename Command

$ basename bin/findhosts.sh

bc Command

$ echo 20.05 + 15.00 | bc

bg Command

$ tar -czf home.tar.gz .
$ bg 
$ jobs

bzip2 Command

$ bzip2 -z filename      #Compress
$ bzip2 -d filename.bz2  #Decompress

cal Command

$ cal

cat Command

$ cat file.txt

chgrp Command

$ chgrp tecmint users.txt

chmod Command

$ chmod +x sysinfo.sh

chown Command

$ chmod -R www-data:www-data /var/www/html

cksum Command

$ cksum README.txt

clear Command

$ clear

cmp Command

$ cmp file1 file2

comm Command

$ comm file1 file2

cp Command

$ cp /home/tecmint/file1 /home/tecmint/Personal/

date Command

$ date
$ date --set="8 JUN 2017 13:00:00"

dd Command

$ dd if=/home/tecmint/kali-linux-1.0.4-i386.iso of=/dev/sdc1 bs=512M; sync

df Command

$ df -h

diff Command

$ diff file1 file2

dir Command

dir command works like Linux is command, it lists the contents of a directory.

$ dir

dmidecode Command

$ sudo dmidecode --type system

df Command

$ du /home/aaronkilik

echo Command

$ echo “This is TecMint - Linux How Tos”

eject Command

$ eject /dev/cdrom
$ eject /mnt/cdrom/
$ eject /dev/sda

env Command

$ env

exit Command

$ exit

expr Command

$ expr 20 + 30

factor Command

$ factor 10

find Command

$ find /home/tecmint/ -name tecmint.txt

free Command

Free command shows the system memory usage (free, used, swapped, cached, etc.) in the system including swap space. Use the -h option to display output in human friendly format.

$ free -h

grep Command

grep Command searches for a specified pattern in a file (or files) and displays in output lines containing that pattern as follows.

$ grep ‘tecmint’ domain-list.txt

groups Command

groups command displays all the names of groups a user is a part of like this.

$ groups
$ groups tecmint

gzip Command

Gzip helps to compress a file, replaces it with one having a .gz extension as shown below:

$ gzip passwds.txt
$ cat file1 file2 | gzip > foo.gz

gunzip Command

gunzip expands or restores files compressed with gzip command like this.

$ gunzip foo.gz

head Command

head command is used to show first lines (10 lines by default) of the specified file or stdin to the screen:

# ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head

history Command

history command is used to show previously used commands or to get info about command executed by a user.

$ history

hostname Command

hostname command is used to print or set system hostname in Linux.

$ hostname
$ hostname NEW_HOSTNAME

hostnamectl Command

hostnamectl command controls the system hostname under systemd. It is used to print or modify the system hostname and any related settings:

$ hostnamectl
$ sudo hostnamectl set-hostname NEW_HOSTNAME

hwclock

hwclock is a tool for managing the system hardware clock; read or set the hardware clock (RTC).

$ sudo hwclock
$ sudo hwclock --set --date 8/06/2017

hwinfo Command

hwinfo is used to probe for the hardware present in a Linux system like this.

$ hwinfo

id Command

id command shows user and group information for the current user or specified username as shown below.

$ id tecmint

ifconfig Command

ifconfig command is used to configure a Linux systems network interfaces. It is used to configure, view and control network interfaces.

$ ifconfig
$ sudo ifconfig eth0 up
$ sudo ifconfig eth0 down
$ sudo ifconfig eth0 172.16.25.125

ionice Command

ionice command is used to set or view process I/O scheduling class and priority of the specified process.

If invoked without any options, it will query the current I/O scheduling class and priority for that process:

$ ionice -c 3 rm /var/logs/syslog

iostat Command

iostat is used to show CPU and input/output statistics for devices and partitions. It produces useful reports for updating system configurations to help balance the input/output load between physical disks.

$ iostat

ip Command

ip command is used to display or manage routing, devices, policy routing and tunnels. It also works as a replacement for well known ifconfig command.

This command will assign an IP address to a specific interface (eth1 in this case).

$ sudo ip addr add 192.168.56.10 dev eth1

iptables Command

iptables is a terminal based firewall for managing incoming and outgoing traffic via a set of configurable table rules.

The command below is used to check existing rules on a system (using it may require root privileges).

$ sudo iptables -L -n -v

iw Command

$ iw list

iwlist Command

$ iwlist wlp1s0 scanning

kill Command

$ kill -p 2300
$ kill -SIGTERM -p 2300

killall Command

$ killall firefox

kmod Command

$ kmod list

last Command

$ last

ln Command

$ ln -s /usr/bin/lscpu cpuinfo

locate Command

$ locate -b '\domain-list.txt'

login Command

$ sudo login

ls Command

$ ls -l file1

Arjunkumar

Can you share me all questions answer which you mention above?

itdept

Use a search engine and learn the answers at the same time. Spoonfeeding is not going to help

shochan

rohanjoshi0894

thanks for the study guides LMAO!