Linux Basic commands

Question 1

pwd

Answer 1

print current directory

Question 2

cd

Answer 2

change directory

Question 3

ls

Answer 3

list directories

Question 4

ls -l

Answer 4

long list format for ls

Question 5

cat

Answer 5

show the content of files

Question 6

clear

Answer 6

clears the terminal

Question 7

man “command”

Answer 7

the documentation for a given command

Question 8

exit

Answer 8

exits you out of a shell

Question 9

enter

Answer 9

moves down by one line

Question 10

g

Answer 10

go to top of the pag

Question 11

G

Answer 11

go to the bottom of the page

Question 12

Environmental Variables

Answer 12

have a name and value. Access with echo $VAR_NAME

Question 13

$PATH

Answer 13

an env variable that controls the command search path and contains list of directories. This is where the computer goes to look for commands you enter in the terminal

Question 14

which + command

Answer 14

tells you where a command lives in your system

Question 15

–help

Answer 15

used after a command, tells you more information (maybe)

Question 16

.

Answer 16

this directory

Question 17

..

Answer 17

parent directory

Question 18

mkdir -p

Answer 18

Make a directory. -p adds parents, and you can use / to separate, eg:
1/2/3

Question 19

rmdir -p

Answer 19

deletes directories (only if empty)

Question 20

rm -rf

Answer 20

recursively removes directories (deletes everything)