Navigation

Question 1

print name of current working directory

Answer 1

pwd

Question 2

change directory

Answer 2

cd

Question 3

list directory contents

Answer 3

ls

Question 4

change the directory to /usr/bin

Answer 4

cd /usr/bin

Question 5

change the directory to parent directory of /usr/bin which is /usr

Answer 5

cd /usr or cd ..

Question 6

change the directory from /usr to /usr/bin

Answer 6

cd /usr/bin or cd ./bin

Question 7

change the directory to home directory (short cut)

Answer 7

cd

Question 8

change directory to previous directory(short cut)

Answer 8

cd -

Question 9

change the directory to bob home directory

Answer 9

cd ~bob (cd ~username)

Question 10

determine file type

Answer 10

file

Question 11

view text file content

Answer 11

less filename

Question 12

list a specify directory /usr

Answer 12

ls /usr

Question 13

list multiple directory (home and usr)

Answer 13

ls ~ /usr

Question 14

list the information of file in current directory (long format)

Answer 14

ls -l

Question 15

list all the file include hidden files

Answer 15

ls -a

Question 16

list the directory itself

Answer 16

ls -d

Question 17

append an indicator character to the end of each listed name for classify when listing

Answer 17

ls -F

Question 18

In long format listings, display file sizes in human readable

Answer 18

ls -l -h

Question 19

listing in reverse order sorted by file size or modification time

Answer 19

ls -s -r or ls -t -r

Question 20

how to check the file format of picture.jpg including some description on it

Answer 20

file picture.jpg (file filename)