Linux+ V7 Bash Scripting Fundamentals

1. What does the trap command in Bash allow you to do?

Catch and handle signals or errors

Set up network connections

Create container images

Encrypt sensitive data

2. Which method is used to source external script files into the current Bash environment?

Import script.sh

Include script.sh

Source script.sh or . script.sh

Require script.sh

3. What is the purpose of the getopts command in Bash scripting?

Parse command-line options and arguments

Get the system's boot options

Retrieve environment variables

List available network gateways

4. In string expansion, what does the ${#variable} syntax return?

The variable's memory address

The length of the string

The number of lines in the variable

The hash value of the string

5. Which built-in command reads input from stdin into a variable?

Input

Read

Get

Scan

6. What does the && operator do when chaining commands in Bash?

Runs both commands simultaneously

Executes the second command only if the first succeeds

Combines command output

Redirects errors to a file

7. In Bash arrays, how do you access all elements of an array variable?

${array}

${array[*]}

${array[@]}

Both b and c work

8. How do you make a script executable from the command line?

Chmod +x script.sh

Chmod 755 script.sh

Both a and b work

Use the exec command before running

9. What is the purpose of the shebang (#!) line at the start of a script?

It comments out the first line

It specifies the interpreter to execute the script

It defines the script's encoding

It enables debug mode

10. Which command substitution syntax allows nested command substitution without escaping?

Backticks `command`

Dollar parentheses $(command)

Dollar braces ${command}

None; nesting always requires escaping

11. In a case statement, what does the * pattern match?

Only literal asterisks

Any value (default case)

Multiple digits only

Zero or more spaces

12. In Bash, which command substitution syntax is preferred in modern scripts: $(command) or `command`?

$(command) - more readable and nestable

`command` - faster execution

Both are identical in performance

Backticks are required for functions

13. How do you redirect stderr to the same location as stdout in Bash?

Command > output.txt 2>&1

Command 2> output.txt 1>&2

Command 1> output.txt 2>

Command >> output.txt 2>>

14. Which redirection operator appends output to a file without overwriting?

>

>>

2>

15. In parameter expansion, what does ${variable:-default} accomplish?

Assigns a default if variable is empty or unset

Removes the variable from memory

Converts variable to lowercase

Checks if variable contains a dash

16. What does the [[ ]] construct offer over [ ] in Bash conditionals?

Faster execution speed

Pattern matching and regex support

Compatibility with POSIX shells

No practical difference

17. Which loop structure is best for iterating over a list of items in Bash?

While loop

For loop

Until loop

Case statement

18. What is the difference between $* and $@ when used in a script?

$* expands to separate words; $@ preserves arguments

$@ is faster than $*

Both behave identically in all contexts

$* only works in functions

19. In a Bash function, what does the return statement do?

Outputs text to stdout

Sets the function's exit status code

Returns a variable value to the caller

Terminates the entire script

20. Which variable holds the exit status of the last executed command?

$?

$!

$@

$#

21. What does the -e flag do in a Bash script when used with set?

Enables echo output

Exits immediately if a command fails

Enables variable expansion only

Encrypts script contents

Linux+ V7 Bash Shell Scripting Fundamentals Quiz