Backticks and $() for command substitution in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to store the current date in the variable.

Bash Scripting

current_date=[1]date[2]

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

A[

B$(

C{

D`

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces {} instead of backticks.

Using square brackets [] which are for tests, not command substitution.

Backticks (`) are used to run a command and capture its output in a variable.

2fill in blank

medium

Complete the code to store the current user name using modern command substitution.

Bash Scripting

user_name=[1]whoami

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

A$(

B`

C)

D[

Attempts:

3 left

💡 Hint

Common Mistakes

Using backticks instead of $() which is the newer preferred style.

Using braces or brackets which are not for command substitution.

The modern way to do command substitution is using $(command).

3fill in blank

hard

Fix the error in the code to correctly assign the list of files to a variable.

Bash Scripting

files=[1]ls -1

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

A$(

B`

C)

D[

Attempts:

3 left

💡 Hint

Common Mistakes

Using braces or brackets which cause syntax errors.

Missing closing backtick or parenthesis.

Use $(command) to correctly capture the output of ls -1 into the variable.

4fill in blank

hard

Complete the code to print the current directory using command substitution.

Bash Scripting

echo [1]pwd

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

A$(

B`

C)

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Using backticks without closing them.

Using braces or missing closing parenthesis.

Use $(pwd) to run pwd and print the current directory.

5fill in blank

hard

Complete the code to assign the number of lines in a file to a variable.

Bash Scripting

line_count=[1]wc -l filename.txt

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

A$(

B-l

C)

D`

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing $() and backticks incorrectly.

Forgetting to close the command substitution.

Use $(wc -l filename.txt) to count lines and assign output to variable.