Linux Technical Query!

Arjunkumar

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. 

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

1. 
   

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!