commands

Question 1

/

Answer 1

separation of directories

Question 2

\

Answer 2

topmost directories

Question 3

pwd

Answer 3

present work directory(where you currently in)

Question 4

cd

Answer 4

change directories

Question 5

cd ..

Answer 5

moving up in hierarchy

Question 6

ls

Answer 6

whats inside in this current directory(if its blue it means directory not a file)

Question 7

-l

Answer 7

long output(basically more details of those files)

Question 8

-l ..

Answer 8

upper directory in -l

Question 9

ls -a

Answer 9

all files

Question 10

ls -al

Answer 10

all long files

Question 11

mkdir

Answer 11

make directory

Question 12

tab(the button)

Answer 12

used for autocomplete

Question 13

rmdir

Answer 13

remove directory

Question 14

arrows(on the keyboard)

Answer 14

used for scroll thru the previous commands

Question 15

(letter)*

Answer 15

removes everything what starts with the letter

Question 16

touch

Answer 16

creates an empty file

Question 17

nanao

Answer 17

text editor

Question 18

^(letter)

^symbol means

Answer 18

ctrl when you see for example ^k that means ctrl+k

Question 19

man (the command)

Answer 19

manual guide for the command

Question 20

cat (the file name)

Answer 20

prints off the content of the file on the screen

Question 21

head (the file)

Answer 21

shows the first 10 lines of the file

Question 22

tail (the file)

Answer 22

shows the last 10 lines of the file

Question 23

cp (the file name that you wanna copy to somewhere) (the new place for the file)

Answer 23

copy

Question 24

mv

Answer 24

move

Question 25

mv (the file name) (the new file name)

Answer 25

mv also used for change file names

Question 26

locate (any file name)

Answer 26

will locate the file from the database

Question 27

find (any file name)

Answer 27

wil find the file from the root

Question 28

which (any file name)

Answer 28

used for find program files

Question 29

grep "(word or letter)" (the file name where you search the word or letter)

Answer 29

grep can specify regular expressions and other special character to match different patterns

Question 30

grep -v "(the word or letter)" (the file name)

Answer 30

inverted search meaning all the words or letters that dont match

Question 31

>

Answer 31

redirect the output

Question 32

lR

Answer 32

ls recursive

Question 33

ls -lR /

Answer 33

show the content of that directory and its sub directories and its sub directories and so on

Question 34

stdin

Answer 34

input to a command

Question 35

stdout

Answer 35

normal (expected) output by a command

Question 36

stderr

Answer 36

error output by a command

Question 37

when $ command > file 1. stdin 2. stdout 3. stderr

Answer 37

1. types into the terminal 2. written to a file 3. output to the terminal

Question 38

when $ command &> file 1. stdin 2. stdout 3. stderr

Answer 38

1. typed into the terminal 2. written to a file 3. written to a file

Question 39

whoami

Answer 39

shows the current user

Question 40

echo

Answer 40

printing statement

Question 41

>>

Answer 41

output to be appended

Question 42

ifconfig

Answer 42

show a lot of information about your computer (ip address)

Question 43

|

Answer 43

(this is a vertical bar) shift back backslash (you can write multiple commands in one line)

Question 44

ifconfig | grep "inet addr"

Answer 44

to search just for the ip

Question 45

1. cut 2. -d "" 3: -f (number)

Answer 45

1. takes a string of text and split it into chucks 2. delimiter 3. chuck called field (fields separated by the delimiter character)

Question 46

ctrl+c

Answer 46

stops/deletes any proccess

Question 47

ctrl+z

Answer 47

pause any process

Question 48

jobs

Answer 48

shows the stopped commands

Question 49

fg (the paused job's number) | fg means foreground

Answer 49

resume the process

Question 50

bg | background

Answer 50

run the proccess in the background (you cant see in the terminal)

Question 51

ls -lh (the file name)

Answer 51

shows how big the file is

Question 52

ps

Answer 52

process status (used for find the process id)

Question 53

ps -e | less

Answer 53

shows every process on the OS

Question 54

top

Answer 54

shows the top proccesses, refreshing every second(similar to task manager)

Question 55

su (user name)

Answer 55

switching user

Question 56

sudo

Answer 56

superuser do(basically if you dont have access to do something you will have with sudo)

Question 57

/etc/(command exp:passwd)

Answer 57

keep track all the configuration files

Question 58

locate (mode exp:--all) -c (file)

Answer 58

shows a number of how many files are there

Question 59

vim

Answer 59

used for editing any kind of text and is especially suited for editing computer programs