What a shell script is in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a shell script with the correct shebang line.

Bash Scripting

#![1]
echo "Hello, world!"

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

A/usr/bin/python

B/usr/bin/node

C/bin/shutdown

D/bin/bash

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong interpreter path like /usr/bin/python for a shell script.

Forgetting the #! at the start of the script.

The shebang line #!/bin/bash tells the system to use the Bash shell to run the script.

2fill in blank

medium

Complete the code to assign a value to a variable in a shell script.

Bash Scripting

name=[1]
echo "Hello, $name!"

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

A"Alice"

BAlice

C'Alice'

D$Alice

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning a value without quotes can cause errors if the value has spaces.

Using single quotes prevents variable expansion but is okay for plain strings.

In shell scripts, variable values with spaces or special characters should be quoted using double quotes.

3fill in blank

hard

Fix the error in the script to correctly print the current directory.

Bash Scripting

echo "Current directory is: [1]"

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

Apwd

B$pwd

C$(pwd)

D`pwd`

Attempts:

3 left

💡 Hint

Common Mistakes

Writing pwd without command substitution just prints the word 'pwd'.

Using $pwd tries to expand a variable named pwd which is usually empty.

Using $(pwd) runs the pwd command and inserts its output into the echo statement.

4fill in blank

hard

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

Bash Scripting

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

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

A1 2 3 4 5

B$i

D1..5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1..5 does not create a list in bash.

Printing i without $ prints the letter 'i' instead of the variable value.

The loop iterates over the list '1 2 3 4 5' and prints each value stored in $i.

5fill in blank

hard

Fill all three blanks to create a conditional that checks if a file exists.

Bash Scripting

if [[ -[1] [2] ]]; then
  echo "File [3] exists."
else
  echo "File does not exist."
fi

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

Ae

Bmyfile.txt

Cf

Dfile.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using -f checks if it is a regular file but -e is more general.

Using different filenames in the test and echo causes confusion.

The -e flag checks if a file exists. The filename is 'myfile.txt' used in both places.