LPI Linux Essentials Shell Scripting Basics

1. In bash, what does the && operator do?

Runs commands in sequence regardless of success

Runs the next command only if the previous one succeeds

Redirects output to a file

Creates a background process

2. What is the purpose of the 'case' statement in shell scripting?

Converts text to uppercase

Selects one block to execute based on a value match

Tests multiple file conditions

Defines a variable scope

3. Which operator in bash checks if two strings are equal?

-eq

==

=

-z

4. What does the 'test' command or [ ] operator evaluate?

File and string conditions

Only numeric comparisons

Only file permissions

Only string lengths

5. How do you define a function in a bash script?

Function_name() { commands; }

Def function_name(): commands

Function function_name { commands }

Define function_name(commands)

6. In bash, what is the function of the 'echo' command?

Reads input from a file

Displays text or variable values to output

Creates a new variable

Executes another script

7. What does the 'grep' command typically do in a shell script?

Creates new files

Searches for patterns in text

Moves files between directories

Changes file permissions

8. Which special variable contains the first argument passed to a script?

$0

$1

$@

$?

9. How do you pass arguments to a shell script when executing it?

Bash script.sh arg1 arg2

./script.sh arg1 arg2

Both a and b are correct

Arguments must be defined in the script first

10. What is the purpose of the 'exit' command in a script?

Terminates the script and returns an exit code

Exits only the current loop

Clears all variables

Closes the terminal

11. Which shebang line is correct for a bash shell script?

#!/bin/bash

#!/bash

#/bin/bash

#!/usr/bin/sh

12. Which command is used to execute a shell script stored in a file?

Bash script.sh

./script.sh

Source script.sh

All of the above

13. What does the 'read' command do in a shell script?

Reads a file and displays its contents

Reads user input from standard input

Reads environment variables

Reads command history

14. How do you iterate through a list of values in a for loop?

For i in 1 2 3; do echo $i; done

For (i=1; i

For i = 1 to 3 echo $i

Foreach i (1 2 3) echo $i

15. What is the purpose of the -z test operator in bash conditionals?

Test if a string is zero

Test if a string is empty

Test if a number is zero

Test if a file exists

16. Which of the following is the correct syntax for an if statement in bash?

If [ $x -eq 5 ] then echo 'yes' fi

If [ $x -eq 5 ]; then echo 'yes'; fi

If($x == 5) { echo 'yes'; }

If $x equals 5 echo 'yes'

17. What does the $# variable represent in a shell script?

The script name

The number of arguments passed

The exit status of the last command

The process ID of the script

18. Which command substitution syntax is preferred in modern bash scripts?

`command`

$(command)

{command}

[command]

19. In a bash script, how do you assign a value to a variable?

Variable = value

Variable=value

Set variable value

$variable=value

20. How do you make a shell script executable?

Chmod +x script.sh

Chmod 755 script.sh

Chown +x script.sh