Command Lines

Question 0

hostname

Answer 0

my computer’s network name

Question 1

pwd

Answer 1

print work directory

Question 2

mkdir

Answer 2

make directory

Question 3

ls

Answer 3

list directory

Question 4

cd

Answer 4

change directory

Question 5

rmdir

Answer 5

remove directory

Question 6

print working directory

Answer 6

pwd

Question 7

my computer’s network name

Answer 7

hostname

Question 8

Make directory

Answer 8

mkdir

Question 9

change directory

Answer 9

cd

Question 10

list directory

Answer 10

ls

Question 11

remove directory

Answer 11

rmdir

Question 12

pushd

Answer 12

push directory

Question 13

push directory

Answer 13

pushd

Question 14

popd

Answer 14

pop directory

Question 15

pop directory

Answer 15

popd

Question 16

cp

Answer 16

copy a file or directory

Question 17

copy a file or directory

Answer 17

cp

Question 18

mv

Answer 18

move a file or directory

Question 19

move a file or directory

Answer 19

mv

Question 20

less

Answer 20

page through a file

Question 21

page through a file

Answer 21

less

Question 22

cat

Answer 22

print the whole file

Question 23

print the whole file

Answer 23

cat

Question 24

xargs

Answer 24

execute argument

Question 25

execute argument

Answer 25

xargs

Question 26

find

Answer 26

find files

Question 27

find files

Answer 27

find

Question 28

grep

Answer 28

find things inside files

Question 29

find things inside files

Answer 29

grep

Question 30

man

Answer 30

read a manual page

Question 31

read a manual page

Answer 31

man

Question 32

apropos

Answer 32

find what man page is appropriately

Question 33

find what man page is appropriate

Answer 33

apropos

Question 34

env

Answer 34

look at your environment

Question 35

look at your environment

Answer 35

env

Question 36

echo

Answer 36

print some arguments

you can use echo command to write and overwrite data to a file using command line in terminal

echo “hello you” test.txt
this will overwrite any existing data in file test.txt with text hello you.

Question 37

print some arguments

you can use this command to write and overwrite data to a file using command line in terminal

Answer 37

echo

echo “hello you” test.txt

this will overwrite any existing data in file test.txt with text hello you.

Question 38

export

Answer 38

export/ set a new environment variable

Question 39

export/ set a new environment variable

Answer 39

export

Question 40

exit

Answer 40

exit the shell

Question 41

exit the shell

Answer 41

exit

Question 42

sudo

Answer 42

DANGER! become super user root DANGER!

Question 43

chown

Answer 43

change file owner and group

Question 44

chmod

Answer 44

Change access permissions of files