command line

Question 0

hostname

Answer 0

my computers network name

Question 1

pwd

Answer 1

print working directory

Question 2

mkdir

Answer 2

make directory

Question 3

cd

Answer 3

change directory

Question 4

ls

Answer 4

list directory

Question 5

rmdir

Answer 5

remove directory

Question 6

pushd

Answer 6

push directory

Question 7

popd

Answer 7

pop directory

Question 8

cp

Answer 8

copy a file or directory

Question 9

mv

Answer 9

move a file or directory

Question 10

less

Answer 10

page through a file

Question 11

cat

Answer 11

print the whole file

Question 12

xargs

Answer 12

execute arguments

Question 13

find

Answer 13

find files

find STARTDIR -name WILDCARD - print

example: find . -name “*.txt” - print | less

less is to show files on the same screen on the terminal

Question 14

grep

Answer 14

find things inside files

Question 15

man

Answer 15

read a manual page

Question 16

apropos

Answer 16

find what man page is appropriate

Question 17

env

Answer 17

look at your environment

Question 18

echo

Answer 18

print some arguments

Question 19

export

Answer 19

export/set a new environment variable

Question 20

exit

Answer 20

exit the shell

Question 21

sudo

Answer 21

DANGER! become super user root DANGER!

Question 22

chmod

Answer 22

change permission modifiers

Question 23

chown

Answer 23

change ownership

Question 24

rm -Rf

Answer 24

remove a file

Question 25

command k

Answer 25

clear terminal

Question 26

touch

Answer 26

make a file

Question 27

cp -r

Answer 27

copy directory with files in it

Question 28

q

Answer 28

go back in terminal

Question 29

|

Answer 29

takes the output from the command on the left, and “pipes” it to the command on the right

Question 30

<

Answer 30

take and send the input from the file on the right to the program on the left.

Question 31

>

Answer 31

takes the output of the command on the left, then writes it to the right on the file

Question 32

> >

Answer 32

takes the output of the command on the left, then appends it to the file on the right

Question 33

*

Answer 33

matches anything in a wildcard like *.txt

Question 34

man

Answer 34

use to define commands

example: man grep

Question 35

control d

Answer 35

to exit program like python from terminal