5. Fundermental Daily Linux Commands

Question 1

What is the difference between ls and ll?

Answer 1

The ls command displays the contents of a given directory.
The ll command not only displays the content but also the content alongside their permissions, creator, date of creation, etc.

Question 2

What commands can be used to display the contents of a directory alongside their permissions, creator, date of creation, etc?

Answer 2

Either you use ls -l or ll

Question 3

Which command is used to display all contents of the directory including hidden files and sub-directories?

Answer 3

ls -a

Question 4

What commands will be used to display the contents of a directory arranged in ascending or descending order by modification time?

Answer 4

ll -tr, for ascending order
ll -t, for descending order

Question 5

What command is used to switch the user’s home directory?

Answer 5

cd ~

Question 6

What command is used to display the current directory a user is in?

Answer 6

pwd

Question 7

Which command is used to create a new directory?

Answer 7

mkdir directory_name

Question 8

Which command is used to create nested directories?

Answer 8

mkdir -p dir/dir1/dir2/………./dirn

or

mkdir -pv dir/dir1/dir2/………./dirn, for more detailed information about the created directories

Question 9

Which command is used to create a file in Linux?

Answer 9

touch filename.ext

Question 10

What command is used to display text on the terminal?

Answer 10

echo “text”

Question 11

What command is used to display the tree structure of a directory?

Answer 11

tree

Question 12

What command is used to copy and paste files in Linux?

Answer 12

cp filename.ext destination_directory

Question 13

What command is used to move(cut and paste) files in Linux?

Answer 13

mv filename.ext destination_directory

Question 14

What command is used to delete a file in Linux?

Answer 14

rm filename.txt

Question 15

What command is used to delete a directory in Linux?

Answer 15

rm -r directory_name

or

rm -rf directory_name ( to remove the directory forcefully)

Question 17

What command is used to change the name of a file or directory?

Answer 17

mv filename newfilename
mv dirname newdirname

Question 18

What will you use to display all the lines in a file that contains a particular string/string of characters?

Answer 18

grep “string” filename.ext

grep -i “string” filename.ext (for it to be case insensitive)

Question 19

What command will you use to display all the lines that contain a specific string of characters, in every file in the directory and its sub-directories?

Answer 19

grep -r “string” path

Question 20

Which command is used to find a file in a directory?

Answer 20

find dir_path -name “filename.ext”

Question 21

Which command is used to list all the directories in a given path?

Answer 21

find dir_path -type d

Question 22

What command is used to sort the lines of text in a file and display them?

Answer 22

sort filename.ext

Question 23

What command is used to sort the lines of text in a file and display them in Reverse Order?

Answer 23

sort -r filename.ext

Question 24

What command is used to sort the lines of text in a file by number and display them?

Answer 24

sort -n filename.ext

Question 25

What command is used to sort lines of text in a file by their second column?

Answer 25

sort -k2 filename.ext