Unix

Question 1

ls

Answer 1

list files in current directory

Question 2

ls -l

Answer 2

list files in a long format

Question 3

ls -a

Answer 3

list all files (including hidden files) in current directory

Question 4

ls -F

Answer 4

adds indicators to the list output to identify directories and different types of files.

Question 5

.

Answer 5

the current working directory

Question 6

..

Answer 6

the parent directory to working directory

Question 7

~

Answer 7

your home directory

Question 8

/

Answer 8

the root (top-level) directory. This is also the separator for directories

Question 9

*

Answer 9

a wildcard meaning any string of characters

Question 10

?

Answer 10

a wildcard meaning any single character

Question 11

cp file1 file2

Answer 11

makes a copy of file1 and calls it file2

Question 12

mv file1 file2

Answer 12

renames file1 to file2

Question 13

rm file1

Answer 13

removes (deletes) file1

Question 14

rm -i file1

Answer 14

asks for confirmation that you want to delete file1

Question 15

pwd

Answer 15

print the working directory

Question 16

cd dirname

Answer 16

change directory to the one called “dirname”

Question 17

cd ..

Answer 17

change to the parent directory of the current directory

Question 18

cd ~

Answer 18

change to your home directory

Question 19

mkdir dirname

Answer 19

makes a new directory with the name “dirname”

Question 20

rmdir dirname

Answer 20

removes the directory with the name “dirname”. The directory must be empty

Question 21

rm -r dirname

Answer 21

recursively removes directories and subdirectories

Question 22

cat file1

Answer 22

writes the whole of file “file1” to the terminal, also useful for concatenating files

Question 23

more file1

Answer 23

displays the file “file1” a page at a time

Question 24

less file1

Answer 24

a more versatile version of “more”, but less common

Question 25

head -30 file1

Answer 25

Show the first 30 lines

Question 26

tail -25 file1

Answer 26

show the last 25 lines

Question 27

tail -f file1

Answer 27

show the last few lines and keep updating as the file grows

Question 28

wc file1

Answer 28

counts lines, words and characters in a file

Question 29

man utilityname

Answer 29

manual pages for the command “utilityname”

Question 30

ctrl C

Answer 30

interrupts whatever is currently running.
(It can get you out of trouble at embarrassing moments)

Question 31

ctrl Z

Answer 31

puts a foreground process into the background.

Question 32

ctrl S

Answer 32

suspends current terminal

Question 33

ctrl Q

Answer 33

resumes current terminal