Centos 7 File System Stuff

Question 1

df

Answer 1

Shows the amount of disk space used and available on Linux file systems.

Question 2

du

Answer 2

Display the amount of disk space used by the specified files and for each subdirectory.

Question 3

Which file system does centos 7 use?

Answer 3

XFS - high-performance 64-bit journaling file system

Question 4

/bin

Answer 4

All the executable binary programs (file) required during booting, repairing, files required to run into single-user-mode, and other important, basic commands viz., cat, du, df, tar, rpm, wc, history, etc.

Question 5

/boot

Answer 5

Holds important files during boot-up process, including Linux Kernel.

Question 6

/dev

Answer 6

Contains device files for all the hardware devices on the machine e.g., cdrom, cpu, etc

Question 7

/etc

Answer 7

Contains Application’s configuration files, startup, shutdown, start, stop script for every individual program.

Question 8

/home

Answer 8

Home directory of the users. Every time a new user is created, a directory in the name of user is created within home directory which contains other directories like Desktop, Downloads, Documents, etc.

Question 9

/lib

Answer 9

The Lib directory contains kernel modules and shared library images required to boot the system and run commands in root file system.

Question 10

/lost+found

Answer 10

This Directory is installed during installation of Linux, useful for recovering files which may be broken due to unexpected shut-down.

Question 11

/mount

Answer 11

Temporary mount directory is created for removable devices viz., media/cdrom.

Question 12

/mnt

Answer 12

Temporary mount directory for mounting file system.

Question 13

/opt

Answer 13

Optional is abbreviated as opt. Contains third party application software. Viz., Java, etc.

Question 14

/proc

Answer 14

A virtual and pseudo file-system which contains information about running process with a particular Process-id aka pid.

Question 15

/root

Answer 15

This is the home directory of root user and should never be confused with ‘/‘

Question 16

/run

Answer 16

This directory is the only clean solution for early-runtime-dir problem.

Question 17

/sbin

Answer 17

Contains binary executable programs, required by System Administrator, for Maintenance. Viz., iptables, fdisk, ifconfig, swapon, reboot, etc.

Question 18

/srv

Answer 18

Service is abbreviated as ‘srv‘. This directory contains server specific and service related files.

Question 19

/sys

Answer 19

Modern Linux distributions include a /sys directory as a virtual filesystem, which stores and allows modification of the devices connected to the system.

Question 20

/tmp

Answer 20

System’s Temporary Directory, Accessible by users and root. Stores temporary files for user and system, till next boot.

Question 21

/usr

Answer 21

Contains executable binaries, documentation, source code, libraries for second level program.

Question 22

/var

Answer 22

Stands for variable. The contents of this file is expected to grow. This directory contains log, lock, spool, mail and temp files.