Module 2

Question 1

Section 1

Answer 1

User commands
Both executable & shell programs

Question 2

Section 2

Answer 2

System calls
Kernel routines that are invoked from user space

Question 3

Section 3

Answer 3

Library functions
Provided by program libraries

Question 4

Section 4

Answer 4

Special files
Such as device files

Question 5

Section 5

Answer 5

File formats
For many configuration files & structures

Question 6

Section 6

Answer 6

Game & screensavers
Historical section for amusing programs

Question 7

Section 7

Answer 7

Conventions, standards, & miscellaneous
Protocols & file systems

Question 8

Section 8

Answer 8

System administration & privileges commands
Maintenance tasks

Question 9

Section 9

Answer 9

Linux kernel API
Internal kernel cells

Question 10

Spacebar

Answer 10

Scroll forward (down) one screen

Question 11

PageDown

Answer 11

Scroll forward one screen

Question 12

PageUp

Answer 12

Scroll backward (up) one screen

Question 13

DownArrow

Answer 13

Scroll forward one line

Question 14

UpArrow

Answer 14

Scroll backward one line

Question 15

D

Answer 15

Scroll forward one half-screen

Question 16

U

Answer 16

Scroll backward one half-screen

Question 17

/string

Answer 17

Search forward for “string” in the man page

Question 18

N

Answer 18

Repeat previous search forward in the man page

Question 19

Shift+N

Answer 19

Repeat previous search backward in the man page

Question 20

G

Answer 20

Go to the start of the man page

Question 21

Shift+G

Answer 21

Go to the end of the man page

Question 22

Q

Answer 22

Exit man & return to the command shell prompt

Question 23

man

Answer 23

Allows users to view the reference manual of a command or utility run in the terminal

Question 24

less

Answer 24

Terminal pager program used to view the contents of a text file one screen at a time

Question 25

tee

Answer 25

Used w/ a pipe, reads standard input, then writes the output of a program to standard output & simultaneously copies it into the specified file or files

Copies its standard input to its standard output & also redirects its standard output to the files that are given as arguments to the command

Question 26

set

Answer 26

Lists all shell variables that are currently set

Question 27

export

Answer 27

Can assign any variable that is defined in the shell as an environment variable by marking it for export

Displays all exported variables

Question 28

unalias

Answer 28

Unsets an alias

Question 29

Standard Input

Answer 29

Channel 0
Reads input from the keyboard
stdin

Question 30

Standard Output

Answer 30

Channel 1
Sends normal output to the terminal
stdout

Question 31

Standard Error

Answer 31

Channel 2
Sends error message to the terminal
stderr

Question 32

> file

Answer 32

Redirect stdout to overwite a file

Question 33

> > file

Answer 33

Redirect stdout to append a file

Question 34

2>file

Answer 34

Redirects stderr to overwrite a file

Question 35

2>/dev/null

Answer 35

Discard stderr error messages by redirecting them to /dev/null

Question 36

> file 2>&1

Answer 36

Redirect stdout & stderr to overwrite the same file

Same as: &>file

Question 37

&>file

Answer 37

Redirect stdout & stderr to overwrite the same file

Same as: > file 2>&1

Question 38

> > file 2>&1

Answer 38

Redirect stdout & stderr to append to the same file

Same as: &» file

Question 39

&» file

Answer 39

Redirect stdout & stderr to append to the same file

Same as:&raquo_space; file 2>&1

Question 40

Vim - “u” key

Answer 40

Undoes the most recent edit

Question 41

Vim - “x” key

Answer 41

Deletes a single character

Question 42

Vim - “:w” command

Answer 42

Writes (saves) the file & remains in command mode for more editing

Question 43

Vim - “:wq” command

Answer 43

Writes (saves) the file & quits Vim

Question 44

Vim - “:q!” command

Answer 44

Quits Vim, & discards all file changes since the last write

Question 45

Insert Mode

Answer 45

“i”

All typed of text becomes file content

Question 46

Visual Mode

Answer 46

“v”

Multiple characters may be selected for text manipulation

Question 47

Extended Command Mode

Answer 47

”:”

Perform tasks such as writing the file (to save it) & quitting the Vim editor

Question 48

Command Mode

Answer 48

Used for navigation & text manipulation