Documentation with comments in Bash Scripting - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this commented Bash script?

Consider the following Bash script with comments. What will it print when run?

Bash Scripting

#!/bin/bash
# This script prints a greeting

echo "Hello, world!"  # Print greeting

A Hello, world!

B # This script prints a greeting

C echo "Hello, world!"

D No output

💡 Hint

Comments start with # and are ignored by the shell.

The script prints the text inside echo. Comments are ignored and do not print.

📝 Syntax

intermediate

Which option correctly comments out a line in Bash?

In Bash scripting, how do you comment out a single line?

A // This is a comment

B <!-- This is a comment -->

C # This is a comment

D /* This is a comment */

💡 Hint

Bash uses a special character at the start of the line for comments.

In Bash, the # character starts a comment until the end of the line.

🔧 Debug

advanced

Why does this script print the comment text?

Look at this Bash script: #!/bin/bash #echo "Hello" echo "#Hello" Why does it print '#Hello' instead of nothing?

A Because the script has a syntax error

B Because the # inside quotes is treated as text, not a comment

C Because the # is ignored only at the start of the line

D Because echo always prints comments

💡 Hint

Think about how quotes affect comments in Bash.

Comments start with # only outside quotes. Inside quotes, # is normal text.

🚀 Application

advanced

Add comments to explain this Bash script

Here is a Bash script: #!/bin/bash for i in {1..3}; do echo "Number $i" done Which option shows the script with clear comments added?

A

#!/bin/bash
for i in {1..3}; do
  echo "Number $i"
done # Loop ends

B

#!/bin/bash
for i in {1..3}; do
  echo "Number $i" # Loop
# done

C

#!/bin/bash
for i in {1..3}; do
  echo "Number $i"
# done

D

#!/bin/bash
# Loop from 1 to 3
for i in {1..3}; do
  # Print the current number
  echo "Number $i"
done

💡 Hint

Good comments explain what each part does clearly.

Option D adds comments before the loop and inside it explaining the purpose clearly.

🧠 Conceptual

expert

What is the purpose of comments in Bash scripts?

Why do we add comments in Bash scripts? Choose the best answer.

A To explain the code to humans and make it easier to understand and maintain

B To make the script run faster by skipping commented lines

C To prevent the script from running any commands

D To encrypt the script content for security

💡 Hint

Think about who reads comments and why.

Comments help people understand the code but do not affect how the script runs.