Module 11: Basic scripting

Question 1

What is a shell script?

Answer 1

A file of executable commands that has been stored in a text file

Question 2

Which text editor is used? What command?

Answer 2

Nano
Command: nano with script name
Nano test.sh

Question 3

How to write a script?

Answer 3

Nano command
To get into the text editor

Question 4

How to write a script inside text editor

Answer 4

Start with #! /bin/sh or bash
And then write the commands you want the script to do

Question 5

How to search the document

Answer 5

Control and W

Question 6

What are variables?

Answer 6

Holds temporary information in the script

Question 7

What are conditionals?

Answer 7

It lets you do different things based on tests you write

Question 8

What are loops

Answer 8

Let’s you do the same thing over and over

Question 9

How to assign a variables

Answer 9

VARIABLE NAME = “value”
No spaces in between
To include the name, it should precede a $ sign

Question 10

What is the read command?

Answer 10

Can accept a string right from the keyboard or as part of command redirection

Question 11

How to create a new file with vi editor?

Answer 11

Vi filename

Question 12

When I you create a new file, what should you type to go in insert mode?

Answer 12

i

Question 13

How to exit insert mode and quit?

Answer 13

Esc key
Type :wq to write file and quit

Question 14

Which key moves line up and down in command mode?

Answer 14

J goes down and k goes up

Question 15

Which command moves right and left when in command mode

Answer 15

L moves right and h moves left

Question 16

Which command moves cursor to the beginning and end of word

Answer 16

W moves to the beginning of word and e moves to the end of word

Question 17

Which command moves cursor to beginning of previous word?

Answer 17

B

Question 18

How to delete a word

Answer 18

Using the dw command

Question 19

How to undo a last operation

Answer 19

Using the u command

Question 20

How to delete two words?

Answer 20

2dw

Question 21

How to delete characters at a time

Answer 21

Using x
Example: xxxx

Question 22

How to undo last four operations

Answer 22

4u

Question 23

How to delete 14 characters

Answer 23

14x

Question 24

How to delete characters from the left

Answer 24

Capital X
Ex:
5X

Question 25

How to delete a current line

Answer 25

dd

Question 26

How to paste a deleted line

Answer 26

command p

Question 28

How to move to a word and delete from current position to the end of the line

Answer 28

number(w) D Example: 4w D

Question 29

How to join two lines?

Answer 29

command J

Question 30

How to copy the current word

Answer 30

yw command

Question 31

What does this command do: :%s/ext //g

Answer 31

Searches for the word text and deletes it

Question 32

How to open a blank line

Answer 32

o command

Question 33

How to open a blank line above the current line

Answer 33

Capital O

Question 34

how to change word

Answer 34

cw

Question 35

How to add text at beginning of a line

Answer 35

Using capital I

Question 36

How to add text at the end of a line

Answer 36

Upper case A

Question 37

What to always include at the beginning when creating a shell script

Answer 37

Shebang #!/bin/bash

Question 38

What is chmod command used for?

Answer 38

To change permissions on the file so that the file can be executed

Question 39

What is the test command

Answer 39

Compares two numbers or strings for things like equal to less than etc

Question 40

What does the seq command do?

Answer 40

Can generate a list of integer value if you run it with the for loop

Question 41

What is the correct way to save the current directory to a variable?

Answer 41

A= `pwd`

Question 42

How to assign the result of a command to a variable?

Answer 42

Using back ticks VAR=`command`

Question 43

How do you assign a current directory to a variable?

Answer 43

CURRENT=`pwd`

Question 44

What does $1 represent in a script

Answer 44

The first argument passed to the script

Question 45

What does $0 represent in a script?

Answer 45

The name of the script

Question 46

What does exit code of 1 mean?in grep

Answer 46

String not found error

Question 47

What does exit code of 0 mean

Answer 47

Success/OK

Question 48

How do you check the exit status of the last command?

Answer 48

$?

Question 49

What is the basic structure of an if statement in Bash?

Answer 49

If command; then fi

Question 50

What does this do: if grep -q root /etc/passwd; then

Answer 50

Checks if root is in /etc/passwd

Question 51

What does test -f path check?

Answer 51

If a file exist

Question 52

What does test -d /path check

Answer 52

If a directory exist

Question 53

What does test ! -f /path do?

Answer 53

If a file does not exist

Question 54

What does test 1 -eq 1 mean

Answer 54

Numeric equality returns 0 if true

Question 55

What does -ne mean in test 1 -ne 2

Answer 55

Numeric inequality

Question 56

What is square bracket used for

Answer 56

An alias for test