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CompTIA Linux > Basic Linux Tasks > Flashcards

Basic Linux Tasks Flashcards

1
Q

What is Kernel?

A

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

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2
Q

How to open multiple shell?

A

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

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3
Q

How to determine the current Shell?

A

echo $SHELL

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4
Q

How to navigate with |more

A

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

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5
Q

What is head and tail commands?

A

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

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6
Q

What is Piping commands

A

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

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7
Q

How to issue multiple commands

A

Use semicolon

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8
Q

What is exec command?

A

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

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9
Q

What is the uptime command?

A

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

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10
Q

What is who command?

A

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

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11
Q

what is whoami

A

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

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12
Q

what is w command

A

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

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13
Q

what is last command

A

Displays the history of user login in and out

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14
Q

What is wall command

A

Send a message to all the logged in users

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15
Q

What is echo command

A

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

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16
Q

what is man command?

A

Used to display manual for a command

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17
Q

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

A

apropos

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18
Q

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

A

whatis

19
Q

what is a service on Linux?

A

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

20
Q

What is a deamon ?

A

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

21
Q

What is the first process run on boot

A

Init

22
Q

What is init responsible for

A

runlevel of the system

23
Q

what is runlevel

A

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.

24
Q

How can you change runlevel

A

using telinit command

25
Q

What is Upstart Init Daemon?

A

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.

26
Q

What environment variables that init daemon sets from the runlevel event

A

RunLevel and Prelevel

27
Q

What is Systemd Init Daemon?

A

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

28
Q

What command allows control over the Systemd Init process.

A

systemctl

29
Q

Where would the boot loader choosen placed?

A

Master BootRecord (MBR)

30
Q

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

A

GRUB

31
Q

what is a service on Linux?

A

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

32
Q

What is a deamon ?

A

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

33
Q

What is the first process run on boot

A

Init

34
Q

What is init responsible for

A

runlevel of the system

35
Q

what is runlevel

A

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.

36
Q

How can you change runlevel

A

using telinit command

37
Q

What is Upstart Init Daemon?

A

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.

38
Q

What environment variables that init daemon sets from the runlevel event

A

RunLevel and Prelevel

39
Q

What is Systemd Init Daemon?

A

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

40
Q

What command allows control over the Systemd Init process.

A

systemctl

41
Q

Where would the boot loader choosen placed?

A

Master BootRecord (MBR)

42
Q

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

A

GRUB

43
Q

What is cat

A

Concante files toghther such as cat filename1 filename2 > newfile

CompTIA Linux (3 decks)

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