Learning Unix

Question 1

how to check hostname?

Answer 1

hostname

Question 2

How to check your current location

Answer 2

pwd

Question 3

How to check system date and time

Answer 3

date

Question 4

how to check system date/ Current date

Answer 4

date +%D

Question 5

How to check system time

Answer 5

date +%T

Question 6

How to check only hour

Answer 6

date +%H

Question 7

How to check with Hour with min

Answer 7

date +%H:%M

Question 8

How to check file and directory/ Folder we have in present location

Answer 8

ls

Question 9

How to display the detail explanation about files and folder

Answer 9

ls -ltr

Question 10

How to know the file size in kb/mb

Answer 10

ls -lh

Question 11

How to clear the terminal

Answer 11

clear

Question 12

How to create any folder

Answer 12

mkdir folder_name/directory

Question 13

how to enter new folder

Answer 13

cd folder_name

Question 14

how to create file

Answer 14

touch file_name

So that means you can actually add any file you’d like

Question 15

How to open any file name

Answer 15

cat file_name
view file_name
less file_name ( Shift+g is to go last line of the terminal ….. press p to read the first line

Question 16

How to edit any existing file

Answer 16

vi file_name

Question 17

How to remove/delete any file

Answer 17

rm file_name

Question 18

how to delete folder/directory

Answer 18

rmdir folder_name OR rm -rf folder_name

Question 19

How to change/rename existing file_name

Answer 19

mv old_file_name new_file_name

Question 20

How to move one file from one location to another

Answer 20

mv file_name path(where we want to move that file)

Question 21

How to copy any file

Answer 21

cp file_name new_file_name

Question 22

how to display first four lines

Answer 22

head -4 file_name

Question 23

how to display last four lines

Answer 23

tail -4 file_name

Question 24

How to read or display top 5 lines from any file

Answer 24

head -5 file_name

Question 25

How to read display or display bottom/last 10 lines from any file

Answer 25

tail -10 file_name

Question 26

How to sort the content from a file

Answer 26

sort file_name

Question 27

How to sort the content and then put the sort content into the new file

Answer 27

sort file_name > new_file_name

Question 28

How to reverse sort the content

Answer 28

sort -r file_name

Question 29

How to display a unique content/record from a file

Answer 29

sort file_name | uniq

Question 30

If a file has 16 lines how to split this file in 3 different file ?

Answer 30

split -1 4 file_name

Question 31

How to search a word and to display any word from a file

Answer 31

grep "word" file_name

Question 32

How to search multiple word from a file

Answer 32

egrep "first_word"|second_word" file_name

Question 33

How to create 10 files by using range of pattern

Answer 33

touch {1..10}

Question 34

How to count number of lines in any file

Answer 34

wc -1 file_name

Question 35

How to count word in any file

Answer 35

wc -w file_name

Question 36

How to count total character in any file

Answer 36

wc -c file_name

Question 37

d-------> r--------> w--------> x---------> | This is basically understanding what each letter stands for and what it

Answer 37

-> directory -> read -> write -> execute

Question 38

- + ? | What are these used for ?

Answer 38

- that means to take permission + is used to give permission

Question 39

When it's time to read, write, or execute what are the numbers you would use to command in UNIX ? And what number would you use when it's time to use all permission( read, write, execute) ?

Answer 39

r ---->4 w -----> 2 e -----> 1 (r,w,e) ----> 7

Question 40

When dealing with rwx, what are the first three reasons why we use them ?

Answer 40

1. rwx = user/developer/creator 2. rwx = group member 3. rwx = for client and other team member

Question 41

What unix command is used to give or take permission to any file/directory( folder)

Answer 41

chmod

Question 42

We want to give read, write, and execute permission to developer and no other permission to client or team member ?

Answer 42

chmod +700 file_name ## Footnote The reason why its "700" is because there is NO permission to client thats why we added 0 . We gave permission once that was the issue

Question 43

Give read permission to developer and read,write, permission to team member and read permission to other team (a.sh)

Answer 43

chmod +464 file_name

Question 44

Take execute permission to group member and other client

Answer 44

chmod -011 file_name

Question 45

Take read and write permission to developer and execute permission to group member and other clients

Answer 45

chmod -611 file_name

Question 46

Write a unix command to give read and write permission to user, read and execute permission to team member and read permission to other team member/client

Answer 46

chmod +654 file_name

Question 47

What are variables in unix ?

Answer 47

A variable is a character string to which we assign a value

Question 48

How to create a script and how to run it ?

Answer 48

#!/bin/bash and # First line of script echo "My name is parth" | the echo is how you would right the script

Question 49

Write a script where I need to take 2 variables name = Parth and age = 33 and print below string " My name is Parth Shorey and my age is 33"

Answer 49

#!/bin/bash name = ' Parth Shorey' age = 33 echo "My name is Parth shorey and my age is 33"

Question 50

What are the three commands to run scripts ?

Answer 50

1. ./ script_name 2. bash script_name 3. path/ script_name