Commands

Question 1

cd

Answer 1

change directory

Question 2

pwd

Answer 2

print working directory (show where you are)

Question 3

ls

Answer 3

list all files and directories in the working directory

Question 4

mkdir

Answer 4

create a new directory in the working directory

Question 5

touch

Answer 5

create a new file in the working directory

Question 6

ls -a

Answer 6

lists all contents of the directory, including hidden files and directories

Question 7

ls -l

Answer 7

lists all contents in long format

Question 8

ls -t

Answer 8

lists all contents by the time they were last modified

Question 9

ls -alt

Answer 9

multiple options used together, showing all hidden files and directories in long format, listed by time they were last modified

Question 10

cp

Answer 10

copies files

Question 11

mv

Answer 11

moves and renames files

Question 12

rm

Answer 12

removes files

Question 13

rm -r

Answer 13

removes directories (recursive)

Question 14

>

Answer 14

redirects stdout of a command to a file, overwriting previous content

Question 15

> >

Answer 15

redirects stdout of a command to a file, appending to previous content

Answer 16

redirects stdin to a command

Question 17

|

Answer 17

redirects stdout of a command to another command

Question 18

sort

Answer 18

sorts lines of text alphabetically

Question 19

uniq

Answer 19

filters duplicate, adjacent lines of text

Question 20

grep

Answer 20

searches for text pattern and outputs it

Question 21

sed

Answer 21

searches for a text pattern, modifies it, and outputs it