Linux Filesystem

Question 1

Root directory containing all other directories. Not to be confused with the /root home file.

Answer 1

/

Question 2

Contains the majority of app binaries such as commands used by the base operating system (cat, ls, cd).

Answer 2

/user/bin

Question 3

When installing new things it often places a link inside ___ that leads to where the application is installed rather than actually placing it there.

Answer 3

/bin

Question 4

System binaries that are critical for the system to run. Should typically never be modified.

Answer 4

/sbin

Question 5

Host-specific configuration files for everything from the base OS, to software packages that you install.

Answer 5

/etc

Question 6

How would you find the SSH config file?

Answer 6

Can find the ssh config file with ls /etc/ssh/

Question 7

All the hardware devices.
Can find LVM volumes on hard drives.
It also contains the remote teletype (tty) terminals and the kernel drivers.

Answer 7

/dev

Question 8

Contains all user files that are not root user.

Answer 8

/home

Question 9

Contains reusable code shared between apps, essential shared libraries, and kernel modules.

Answer 9

/lib
/lib64

Question 10

What is a library?
What does it look like?

Answer 10

A library is code used by programs to provide functionality or code that can be reused or shared by multiple programs for a common purpose.

Libraries are .so files in Linux, .ddl in Windows

Question 11

Where auto-mounted drives and removable media are placed

Answer 11

/media

Question 12

Where temporarily mounted filesystems are placed

Answer 12

/mnt

Question 13

Typically used only on desktop Linux versions, its where optional software is installed if it wasn’t installed through the package manager. Addons.

Answer 13

/opt

Question 14

Contains running processes represented as text files. It’s a virtual filesystem used by the kernel to communicate the state of processes running on the system.

Answer 14

/proc

Question 15

Temporary/cache files that are lost upon reboot. Unfinished downloads, etc.

Answer 15

/tmp

Question 16

Multiuser files, commands, applications, etc not required for the OS to run.

Answer 16

/usr

Question 17

Where things meant to be common on every system image in an organization are typically installed.

Answer 17

/usr/share

Question 18

Contains variable files such as backups, caches, logs.

Answer 18

/var

Question 19

Most important directory for troubleshooting

Answer 19

/var/log

Question 20

static files of the boot loader

Answer 20

/boot

Question 21

Contains data for services provided by the system

Answer 21

/srv

Question 22

home directory of the root user

Answer 22

/root

Question 23

Linux filesystem is organized using what?

Answer 23

Filesystem Hierarchy System (FHS)

Question 24

Which of the following is the filesystem for a CD-ROM?

Answer 24

isofs

Question 25

Which virtual or pseudo filesystem is used to interface with the kernel and system as a whole but not with individual processes?

Answer 25

/sys

The /sys virtual filesystem is used to interact with the kernel and system as a whole. It did not provide any method to interact with individual processes and was created to move some of the original functions from /proc to /sys to clean up the /proc structure.