First Bash script in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print 'Hello, World!' in Bash.

Bash Scripting

echo [1]

Drag options to blanks, or click blank then click option'

AHello World

BHello, World!

C'Hello World'

D"Hello, World!"

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes causes Bash to treat words as separate arguments.

Using single quotes without proper spacing changes the output.

In Bash, to print a string with spaces and punctuation, you must enclose it in quotes. Double quotes allow the string to be printed exactly as is.

2fill in blank

medium

Complete the code to assign the value '5' to a variable named count in Bash.

Bash Scripting

count=[1]

Drag options to blanks, or click blank then click option'

A5

B"5"

C'5'

Dfive

Attempts:

3 left

💡 Hint

Common Mistakes

Adding spaces around '=' causes errors.

Using words instead of numbers changes the variable value.

In Bash, to assign a number to a variable, write the number without spaces or quotes.

3fill in blank

hard

Fix the error in the code to print the value of the variable name in Bash.

Bash Scripting

echo [1]

Drag options to blanks, or click blank then click option'

A$name

Bname

C"name"

D'$name'

Attempts:

3 left

💡 Hint

Common Mistakes

Printing the variable name without $ prints the literal text.

Using single quotes prevents variable expansion.

To print the value of a variable in Bash, prefix it with a dollar sign ($).

4fill in blank

hard

Fill both blanks to create a loop that prints numbers 1 to 5 in Bash.

Bash Scripting

for i in [1]
do
  echo [2]
done

Drag options to blanks, or click blank then click option'

A"{1..5}"

Bi

C$i

D1 2 3 4 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the list makes it a single string.

Not using $ before the variable prints the variable name.

The loop iterates over the list '1 2 3 4 5'. Inside the loop, $i prints the current number.

5fill in blank

hard

Fill all three blanks to create a conditional that prints 'Even' for even numbers in Bash.

Bash Scripting

if [ $(( [1] % [2] )) [3] 0 ]; then
  echo "Even"
fi

Drag options to blanks, or click blank then click option'

Anum

B2

C-eq

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '-eq' causes errors in numeric tests.

Using wrong variable names or missing $ in arithmetic.

The expression checks if num modulo 2 equals 0 using -eq for numeric comparison in Bash.

Practice

1. What is the purpose of the first line #!/bin/bash in a Bash script?

easy

A. It comments out the first line so it is ignored.

B. It prints a welcome message when the script runs.

C. It sets the script to run in the background automatically.

D. It tells the system to use the Bash shell to run the script.

Solution

1. Step 1: Understand the shebang line

   The line #!/bin/bash is called a shebang and tells the system which interpreter to use.

2. Step 2: Identify its role in script execution

   This line ensures the script runs with the Bash shell, not another shell or program.

3. Final Answer:

   It tells the system to use the Bash shell to run the script. -> Option D

4. Quick Check:

   Shebang = Bash interpreter [OK]

Hint: Shebang line always points to the shell interpreter [OK]

Common Mistakes:

• Thinking it prints a message
• Confusing it with a comment
• Assuming it runs script in background

2. Which of the following is the correct way to print "Hello, World!" in a Bash script?

easy

A. echo "Hello, World!"

B. printf(Hello, World!)

C. console.log("Hello, World!")

D. print("Hello, World!")

Solution

1. Step 1: Identify the Bash command for output

   In Bash, echo is used to print text to the screen.

2. Step 2: Check syntax correctness

   echo "Hello, World!" correctly prints the message with quotes around the string.

3. Final Answer:

   echo "Hello, World!" -> Option A

4. Quick Check:

   Print command in Bash = echo [OK]

Hint: Use echo to print text in Bash scripts [OK]

Common Mistakes:

• Using print() like in Python
• Using console.log() from JavaScript
• Missing quotes in printf

3. What will be the output of this Bash script?

#!/bin/bash
echo "Start"
echo "End"

medium

A. Start\nEnd

B. Start
End (two lines)

C. Start
End

D. Start End

Solution

1. Step 1: Understand echo behavior

   The echo command prints text followed by a new line by default.

2. Step 2: Analyze the script output

   Two echo commands print "Start" and "End" each on its own line.

3. Final Answer:

   Start End (two lines) -> Option B

4. Quick Check:

   echo adds newline = two lines output [OK]

Hint: Each echo prints on a new line by default [OK]

Common Mistakes:

• Thinking echo prints on same line
• Confusing \n as literal text
• Ignoring new line after echo

4. Identify the error in this Bash script:

#!/bin/bash
echo Hello World

medium

A. Missing quotes around Hello World

B. echo command is misspelled

C. No error, script runs fine

D. Missing shebang line

Solution

1. Step 1: Check script syntax

   The script has a correct shebang line and uses echo properly.

2. Step 2: Understand echo argument rules

   Quotes are optional if no special characters or spaces that confuse shell; here it works fine.

3. Final Answer:

   No error, script runs fine -> Option C

4. Quick Check:

   echo without quotes works here [OK]

Hint: Quotes optional if no special chars or spaces [OK]

Common Mistakes:

• Assuming quotes are always required
• Thinking shebang is missing
• Believing echo is misspelled

5. You want to write a Bash script that prints your name and then the current date. Which script below will do this correctly?

hard

A. #!/bin/bash
echo "My name is Alice"
date

B. #!/bin/bash
print "My name is Alice"
date

C. #!/bin/bash
echo My name is Alice
current_date

D. #!/bin/bash
echo "My name is Alice"; date %Y-%m-%d

Solution

1. Step 1: Check commands for printing text and date

   echo prints text; date prints current date and time.

2. Step 2: Verify script correctness

   #!/bin/bash echo "My name is Alice" date uses echo correctly and calls date without errors.

3. Final Answer:

   #!/bin/bash\necho "My name is Alice"\ndate -> Option A

4. Quick Check:

   Use echo and date commands correctly [OK]

Hint: Use echo for text and date command for current date [OK]

Common Mistakes:

• Using print instead of echo
• Calling undefined commands like current_date
• Incorrect date command syntax