Basic Linux Tasks

Question 1

What is Kernel?

Answer 1

The kernel is the central core of Linux OS that manages all the computer’s physical devices

Question 2

How to open multiple shell?

Answer 2

type bash to open bash shell and csh to open C shell

Question 3

How to determine the current Shell?

Answer 3

echo $SHELL

Question 4

How to navigate with |more

Answer 4

spacebar to view next full page, Enter to view line by line, b to go back and q to quite

Question 5

What is head and tail commands?

Answer 5

Head displays the first 10 lines of each file and tail displays the last 10 lines of each line

Question 6

What is Piping commands

Answer 6

It allows to pipe the output of one command to the next command for example ls|more

Question 7

How to issue multiple commands

Answer 7

Use semicolon

Question 8

What is exec command?

Answer 8

It kills the parent process which is the Bash and run the command as the parent process

Question 9

What is the uptime command?

Answer 9

Displays the time from which the system started running, current time and how many users logged in

Question 10

What is who command?

Answer 10

Used to determine the details of users currently logged in to a system

Question 11

what is whoami

Answer 11

Used to determine which user you are currently logged in to the system

Question 12

what is w command

Answer 12

Determin which user are logged in and what is their last transaction

Question 13

what is last command

Answer 13

Displays the history of user login in and out

Question 14

What is wall command

Answer 14

Send a message to all the logged in users

Question 15

What is echo command

Answer 15

used to display a line of text on the terminal and to display the value stored in a variable

Question 16

what is man command?

Answer 16

Used to display manual for a command

Question 17

How to find which command is used to perform a certain action?

Answer 17

apropos

Question 18

What is the command that displays a short description of the command along with the man page

Answer 18

whatis

Question 19

what is a service on Linux?

Answer 19

is an application or set of applications that perform task in the background.

Question 20

What is a deamon ?

Answer 20

It is a program that runs in the background without the need for human interaction. It lies dormant until an event triggers it.

Question 21

What is the first process run on boot

Answer 21

Init

Question 22

What is init responsible for

Answer 22

runlevel of the system

Question 23

what is runlevel

Answer 23

Specifies the group of process that are started, stopped and managed on Linux system. Init scripts create process a system boot time from a script in the /etc/inittab file.

Question 24

How can you change runlevel

Answer 24

using telinit command

Question 25

What is Upstart Init Daemon?

Answer 25

It is event-based system rather than runlevel-based. Event based means that jobs will be automatically started and stopped by changes to the system state.

Question 26

What environment variables that init daemon sets from the runlevel event

Answer 26

RunLevel and Prelevel

Question 27

What is Systemd Init Daemon?

Answer 27

It is a replacement of SysVinit and Upstart in some Linux distribuiton. It allows for greater concurrency and reduces shell overhead. Control groups (cgroups) are used to track processes instead of PIDS

Question 28

What command allows control over the Systemd Init process.

Answer 28

systemctl

Question 29

Where would the boot loader choosen placed?

Answer 29

Master BootRecord (MBR)

Question 30

What is the Linux boot loader that loads and starts the kernel

Answer 30

GRUB

Question 31

what is a service on Linux?

Answer 31

is an application or set of applications that perform task in the background.

Question 32

What is a deamon ?

Answer 32

It is a program that runs in the background without the need for human interaction. It lies dormant until an event triggers it.

Question 33

What is the first process run on boot

Answer 33

Init

Question 34

What is init responsible for

Answer 34

runlevel of the system

Question 35

what is runlevel

Answer 35

Specifies the group of process that are started, stopped and managed on Linux system. Init scripts create process a system boot time from a script in the /etc/inittab file.

Question 36

How can you change runlevel

Answer 36

using telinit command

Question 37

What is Upstart Init Daemon?

Answer 37

It is event-based system rather than runlevel-based. Event based means that jobs will be automatically started and stopped by changes to the system state.

Question 38

What environment variables that init daemon sets from the runlevel event

Answer 38

RunLevel and Prelevel

Question 39

What is Systemd Init Daemon?

Answer 39

It is a replacement of SysVinit and Upstart in some Linux distribuiton. It allows for greater concurrency and reduces shell overhead. Control groups (cgroups) are used to track processes instead of PIDS

Question 40

What command allows control over the Systemd Init process.

Answer 40

systemctl

Question 41

Where would the boot loader choosen placed?

Answer 41

Master BootRecord (MBR)

Question 42

What is the Linux boot loader that loads and starts the kernel

Answer 42

GRUB

Question 43

What is cat

Answer 43

Concante files toghther such as cat filename1 filename2 > newfile