Accessing array elements in Bash Scripting - Step-by-Step Execution

Concept Flow - Accessing array elements

Define array

↓

Access element by index

↓

Print or use element

↓

End

First, we create an array. Then we pick an element by its position number. Finally, we use or print that element.

Execution Sample

Bash Scripting

my_array=(apple banana cherry)
echo ${my_array[1]}

This script creates an array with three fruits and prints the second fruit.

Execution Table

Step	Action	Array State	Index Accessed	Output
1	Define array my_array	[apple, banana, cherry]	-	-
2	Access element at index 1	[apple, banana, cherry]	1	banana
3	Print element	[apple, banana, cherry]	1	banana
4	End	[apple, banana, cherry]	-	-

💡 Script ends after printing the element at index 1.

Variable Tracker

Variable	Start	After 1	Final
my_array	undefined	[apple, banana, cherry]	[apple, banana, cherry]

Key Moments - 2 Insights

Why does ${my_array[1]} print 'banana' and not 'apple'?

In bash arrays, indexing starts at 0. So index 0 is 'apple', index 1 is 'banana'. See execution_table row 2.

What happens if I try to access an index that does not exist?

Bash returns an empty string for out-of-range indexes. No error occurs. This is why we see no output if index is invalid.

Visual Quiz - 3 Questions

Look at the execution table, what is the output at step 2?

A banana

B apple

C cherry

D No output

💡 Hint

Check the 'Output' column in execution_table row 2.

At which step is the array first defined?

A Step 2

B Step 3

C Step 1

D Step 4

💡 Hint

Look at the 'Action' column for when the array is created.

If we change the index to 0 in ${my_array[0]}, what will be printed?

A banana

B apple

C cherry

D empty string

💡 Hint

Refer to variable_tracker for my_array contents and indexing starting at 0.

Concept Snapshot

Bash arrays start at index 0.
Use ${array[index]} to access elements.
Index must be a number.
Out-of-range index returns empty string.
Example: my_array=(a b c); echo ${my_array[1]} prints 'b'.

Full Transcript

We start by defining an array named my_array with three elements: apple, banana, and cherry. Then we access the element at index 1, which is banana, because bash arrays start counting from zero. Finally, we print the accessed element. If an index is out of range, bash returns an empty string without error. This simple flow helps us get any item from an array by its position.