File System

Question 1

What is udevd?

Answer 1

Daemon that deals with device events, searches for drivers and gives them a mount point in the file system at /dev

Question 2

What is the command to report file system usage?

Answer 2

df

i. e df -ah
* shows all mount points in the file system

Question 3

Where are configuration files stored?

Answer 3

/etc

Question 4

Where are binaries (programs) stored in the file system?

Answer 4

/bin
/sbin
*/sbin contains programs not usually executed by normal users

Question 5

Where are temporary files stored?

Answer 5

/tmp

Question 6

Where is the location of the home folder for root?

Answer 6

/root

exception to being stored in /home

Question 7

What is the location of libraries?

Answer 7

/lib

Question 8

What is the command to get help with the system hierarchy?

Answer 8

man hier

Question 9

How are hard drives named under /dev?

Answer 9

sda - first hard disk
sda1 - first hard disk, first partition
sdb2 - second hard disk, second partition

Question 10

Where are system logs stored?

Answer 10

/var/log

Question 11

What type of file is denoted with permissions brw-rw—-

Answer 11

block device file, as in block hard disk device

first letter b denotes this

Question 12

What type of file is denoted with permissions crw-r—–

Answer 12

character device file

i.e mouse or keyboard

Question 13

What is a block device file?

Answer 13

A place where the driver communicates with the corresponding device hardware

Question 14

What is a difference between character device and block device files?

Answer 14

Block device files buffer on the kernel, stores dump of memory for device to access
Character device file go straight to the device which handles its own buffering

Question 15

What are the 7 file types?

Answer 15

file
directory
character device file
block device file - interface for hardware
symbolic link - interface for hardware
named pipes - legacy
local domain sockets - legacy

Question 16

What is the command to list block devices?

Answer 16

lsblk

Question 17

What are the commands to write an image to usb?

Answer 17

unmount /dev/sda1
dd if=filename.iso of=/dev/sda bs=4M
sync
udisks --unmount /dev/sda
*sda is the usb location in this example

Question 18

What is the command to push cached writes to persistent storage?

Answer 18

sync

Question 19

What is the command to hid a file?

Answer 19

mv file .file