Linux Commands

Question 1

Command to show current working directory?

Answer 1

pwd

Question 2

Command to show the username?

Answer 2

whoami

Question 3

________ is the top-most directory in Linux.

Answer 3

root directory

Question 4

________ will take you to the parent directory or one step up.

Answer 4

cd ..

Question 5

__________ command will take you to the previous used directory.

Answer 5

cd -

Question 6

Different ways to clear the Linux screen?

Answer 6

clear
Ctrl + L

Question 7

Command to show all the files or directories?

Answer 7

ls

Question 8

Command to display the newest file or directory first?

Answer 8

ls -l
ls -lt

Question 9

Command to display the oldest file or directory first?

Answer 9

ls -ltr

Question 10

Command to display the oldest file in a directory first?

Answer 10

ls -lR

Question 11

How to recursively print all the directories and files?

Answer 11

ls -R

Question 12

Command to display all the files including the hidden files that are starting with dot(.)?

Answer 12

ls -a

Question 13

What is the Linux command to print all files and folders recursively including the hidden files?

Answer 13

ls -R -a
or ls -Ra
or ls -aR

Question 14

What does ls -latR command display?

Answer 14

Recursively display all files and directories including the hidden files based on timestamp i.e. the newest one first.
l - long listing.
a - including the hidden files.
t - new ones come first.
R - Recursively print all files and directories.

Question 15

How to create an empty file?

Answer 15

touch filename

Question 16

Command used to change permissions of a file?

Answer 16

chmod

Question 17

How to change the permission of the file from ‘-rw-r–r–’ to ‘-rwxrw-r–’?

Answer 17

chmod 764 filename

Question 18

Command to create a directory?

Answer 18

mkdir

Question 19

chmod 644 file1.
What is the permission given to file1?

Answer 19

-rw-r–r–

Question 20

Command used to display the content in the file?

Answer 20

cat filename

Question 21

How to delete an empty directory?

Answer 21

rmdir dirName
This command will only work when a directory is empty and if it is not empty it shows an error.

Question 22

Command to delete a file?

Answer 22

rm fileName

Question 23

Command to delete a directory with files in it?

Answer 23

rm -R dirName

Question 24

what is the Linux command used to copy?

Answer 24

cp

Question 25

The command used to copy file1 to a directory?

Answer 25

cp existingFile1 dir1

Question 26

what is the command used to copy an existing file to a new file?

Answer 26

cp existingFile1 newFile2

Question 27

Command used to copy directory to another directory?

Answer 27

cp -R dir1 dir2 dir1 will be copied to dir2.

Question 28

What command is used to create a file and lets you enter some data into it?

Answer 28

vi file1

Question 29

The command used to show the first 10 lines in a file?

Answer 29

head filename

Question 30

The command used to show the first 5 lines in a file?

Answer 30

head -5 filename

Question 31

The command used to read the last 10 lines in a file?

Answer 31

tail filename

Question 32

The command used to display all the content in a file

Answer 32

cat filename

Question 33

What command is used to merge/move two files into one file?

Answer 33

cat file1 file2 >> file3

Question 34

What command is used to search a word from all files?

Answer 34

grep word *