Linux commands

Question 1

list

Answer 1

ls

Question 2

remove

Answer 2

rm

Question 3

delete empty directories/folders

Answer 3

rmdir

Question 4

show place

Answer 4

pwd

Question 5

create folder/directory

Answer 5

mkdir

Question 6

create a directory under another directory

the one to create AA under director BB

Answer 6

mkdir AA/BB

Question 7

go to XX

Answer 7

cd XX

Question 8

go to home

Answer 8

cd ~

Question 9

go back one step before

Answer 9

cd..

Question 10

home

Answer 10

~

Question 11

parent folder

Answer 11

..

Question 12

current folder or place

Answer 12

.

Question 13

list of history of creation and owners and rights of file X

Answer 13

ls -l X

Question 14

root

Answer 14

/

Question 15

edit if a XX text file exists or create it

Answer 15

nano XX.txt

Question 16

open a temp space for a text file to name it and save it after done writing

Answer 16

nano

Question 17

read text file XX

Answer 17

cat XX.text

Question 18

get immediately into file ZZ that is in XX that is in home

Answer 18

cd ~/XX/ZZ

Question 19

clear steps

Answer 19

clear

Question 20

remove full directory XX that is not empty step by step

Answer 20

rm -rfi XX

Question 21

move a X file or directory from A directory to B directory, while B is A’s parent directory

Answer 21

mv X ..

Question 22

rename a file X to Z

if Z exists it’s a replacement

Answer 22

mv X Z

Question 23

command moves all files and directories under book to the directory named manual, if manual exists. Otherwise, the directory book is renamed manual.

Answer 23

mv book manual

Question 24

command moves intro to manual/chap1. The name intro is removed from the current directory, and the same file appears as chap1 in the directory manual.

Answer 24

mv intro manual/chap1

Question 25

command moves file chap3 to manual/chap3

Answer 25

mv chap3 manual

Question 26

move several files into one another directory, command moves the chap4 file to the /home/manual/chap4 file directory and the jim/chap5 file to the /home/manual/chap5 file.

Answer 26

mv chap4 jim/chap5 /home/manual

Question 27

use the mv command with pattern-matching characters This command moves all files in the manual directory into the current directory . (period), retaining the names they had in manual. This move also empties manual.

Answer 27

mv manual/* .

Question 28

list command or description

Answer 28

man

Question 29

delete everything that starts with chap

Answer 29

rm chap*

Question 30

delete everything that ends with .jpg

Answer 30

rm *.jpg

Question 31

name the three types of right owners

Answer 31

user group other

Question 32

what is User | how to change it

Answer 32

the owner/creator of the file | sudo chown new-owner filename

Question 33

what is Group how to change it group: new group filename: file to change his group

Answer 33

contains multiple users/owners sudo chgrp group filename

Question 34

show AAA.txt text file with line numbers

Answer 34

cat -n AAA.txt

Question 35

show AA.txt file while specififying numbers of lines | number of lines 5 for example going from the head

Answer 35

cat -n AA.txt | head -5

Question 36

show multiple text files

Answer 36

cat file1.txt; file2.txt;

Question 37

create a file with cat

Answer 37

cat >file1.txt

Question 38

show more or less when content is too much

Answer 38

cat song.txt | more | cat song.txt | less

Question 39

show symbol $ at the end of every line or gap between paragraphs or end of the file example ``` hello everyone, how do you do?$ $ Hey, am fine.$ How's your training going on?$ $ ```

Answer 39

cat -e test.txt

Question 40

Redirecting/cut Multiple Files Contain in a Single File

Answer 40

cat test1 test2 test3 > test

Question 41

redirect one file to another one

Answer 41

cat test > test1 existing contents of the test1 will be overwritten by the contents of the test file.

Question 42

copier contenu de test.txt et le coller à la fin de test1.txt

Answer 42

cat test.txt >> test1.txt

Question 43

supprimer avec confirmation le fichier AA.txt | resultat: remove regular file?y

Answer 43

rm -i AA.txt

Question 44

commande pour changer en administrateur

Answer 44

root

Question 45

comment ajouter et supprimer un utilisateur

Answer 45

deluser X | adduser X

Question 46

comment ouvrir un utilisateur X

Answer 46

su X | et ecrire le mdp

Question 47

comment modifier la date de modification d'un fichier X | et si X n'existe pas, elle creer un fichier vide nommé X

Answer 47

touch X

Question 48

comment chercher les dossier .jpg

Answer 48

locate .jpg

Question 49

comment fair eune mise a jour dans linux et telecharger une commande comme locate

Answer 49

sudo apt-get update | sudo apt install mlocate

Question 50

comment trouver tous les fichier qui surpassent par exemple 10megabytes

Answer 50

find -size +10M

Question 51

comment trouver les fichiers inferieur à 1mega dans la directoire DD

Answer 51

find DD -type f -size -1

Question 52

chercher toutes les directoires dans home

Answer 52

find ~ -type d

Question 53

quels sont les droits des fichiers

Answer 53

r: lecture/copier w: ecriture x: execution

Question 54

chercher fichiers jpg dans directoire DD

Answer 54

find DD/*.jpg -type -f

Question 55

comment changer les droits

Answer 55

``` 3 méthodes sudo chmod u-w+x,g-w+x,o+w chmod 556 (methode de binaire et d'addition) ```

Question 56

calculer les droits par défaut pour 002 umask 002 valeur par défaut 666

Answer 56

determiner la valeur binaire de 002 000000010 et la convertir par la non logique 111111101 666 est egale à 110110110 multiplier bit par bit 110110110 et 111111101 et convertir resultat 110110100 rw-rw-r--

Question 57

afficher les lignes ou le mot "linux" apparait dans os.txt

Answer 57

grep -i linux os.txt

Question 58

compter exactemement l'occurence en etant sensible au majuscule

Answer 58

grep -c linux os.tx

Question 59

compter exactemement l'occurence sans être sensible au majuscules

Answer 59

grep -c -i linux os.txt

Question 60

afficher les lignes dans tous les fichiers qui contienne linux

Answer 60

grep -i linux *

Question 61

afficher ou existe le mot linux

Answer 61

grep -l linux *

Question 62

afficher les fichiers qui contiennent linux

Answer 62

grep -i -l linux *

Question 63

afficher les lignes et leurs nombres qui contiennent linux

Answer 63

grep -i -n linux *