Exam #1 Review

Question 1

man command

Answer 1

manual

Question 2

who command

Answer 2

shows whose logged in

Question 3

ld command

Answer 3

linker-loader

Question 4

cat command

Answer 4

concatenates one file to another

Question 5

pull command

Answer 5

fetches and downloads remote repository and immediately updates local repository to match the content

Question 6

bit

Answer 6

smallest unit of data

Question 7

byte

Answer 7

8 bits

Question 8

word

Answer 8

2 bytes

Question 9

ALU

Answer 9

arithmetic logic unit

Question 10

CU

Answer 10

control unit

Question 11

IP

Answer 11

instruction pointer

Question 12

registers

Answer 12

hold data in CPU (looks normal)

Question 13

How many bytes are AH and AL

Answer 13

1 byte

Question 14

How many bytes are AX

Answer 14

2 bytes

Question 15

How many bytes are EAX

Answer 15

4 bytes

Question 16

How many bytes are RAX

Answer 16

8 bytes

Question 17

What do we use to make an executable?

Answer 17

nasm and ld

Question 18

what is the .data assembly section used for?

Answer 18

data variables (DB, DW, DD)

Question 19

what is the .bss assembly section used for?

Answer 19

uninitialized data

Question 20

what is the .text assembly section used for?

Answer 20

where the main code goes

Question 21

how to declare a variable in assembly

Answer 21

in the .data section:
variable: datatype value
ex: var1: DB 1

Question 22

mov purpose and usage

Answer 22

moves data into register
mov reg, data
ex: mov AX, var1

Question 23

add purpose and usage

Answer 23

adds data into register
add ____, ____

Question 24

inc purpose and usage

Answer 24

increments register by 1
inc register
ex. inc AX

Question 25

dec purpose and usage

Answer 25

decrements register by 1
dec register
ex. dec AX

Question 26

sub purpose and usage

Answer 26

subtracts data into register
sub ____, ____

Question 27

fetch/execute cycle

Answer 27

1) get next instruction from RAM (current IP)
2) Update IP
3) Decode and run

Question 28

Permissions

Answer 28

rwx rwx rwx
owner, group, world
set these to binary to give read, write, execute to desired ppl