Array length in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the length of the array.

Bash Scripting

arr=(apple banana cherry)
echo ${#arr[1]

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

A[@]

B[*]

C[&]

D[#]

Attempts:

3 left

💡 Hint

Common Mistakes

Using ${#arr} which gives length of first element, not array length.

Using ${#arr[*]} which also works but '@' is preferred for clarity.

In bash, ${#arr[@]} gives the number of elements in the array named arr.

2fill in blank

medium

Complete the code to assign the array length to a variable.

Bash Scripting

my_array=(dog cat mouse)
length=[1]

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

Alength ${#my_array[@]}

Becho ${#my_array[@]}

Ccount ${#my_array[@]}

D${#my_array[@]}

Attempts:

3 left

💡 Hint

Common Mistakes

Using echo inside assignment which causes errors.

Using commands like count or length incorrectly.

To assign the length of an array to a variable, use length=${#my_array[@]} without echo.

3fill in blank

hard

Fix the error in the code to correctly print the array length.

Bash Scripting

fruits=(orange lemon lime)
echo ${#fruits[1]

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

A[@]

B[*]

C[&]

D[#]

Attempts:

3 left

💡 Hint

Common Mistakes

Using symbols like '#' or '&' inside brackets which cause errors.

Omitting brackets entirely.

The correct syntax to get array length is ${#array[@]}. Using '@' inside brackets counts all elements.

4fill in blank

hard

Fill both blanks to create an array and print its length.

Bash Scripting

[1]=(red green blue)
echo ${#colors[2]

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

Acolors

B[*]

C[@]

Dfruits

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the array and length call.

Using '*' instead of '@' which also works but '@' is preferred.

First, define the array with colors=(...). Then use ${#colors[@]} to get its length.

5fill in blank

hard

Fill all three blanks to create an array, assign its length to a variable, and print it.

Bash Scripting

[1]=(sun moon stars)
len=[2]
echo [3]

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

Acelestial

B${#celestial[@]}

C$len

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Forgetting the $ when printing the variable.

Define array celestial=(...). Assign length with len=${#celestial[@]}. Print with echo $len.