for loop with range ({1..10}) in Bash Scripting - Step-by-Step Execution

Concept Flow - for loop with range ({1..10})

Start

↓

Set range 1 to 10

↓

Pick next number in range

↓

Execute loop body with number

↓

More numbers?

Yes→Pick next number

No↓

End loop

The loop picks each number from 1 to 10 in order, runs the commands inside the loop for each number, then stops after 10.

Execution Sample

Bash Scripting

for i in {1..10}; do
  echo $i
done

Print numbers from 1 to 10, one per line.

Execution Table

Iteration	i value	Action	Output
1	1	echo $i	1
2	2	echo $i	2
3	3	echo $i	3
4	4	echo $i	4
5	5	echo $i	5
6	6	echo $i	6
7	7	echo $i	7
8	8	echo $i	8
9	9	echo $i	9
10	10	echo $i	10
-	-	No more numbers in range	Loop ends

💡 After printing 10, no more numbers in the range {1..10}, so loop stops.

Variable Tracker

Variable	Start	After 1	After 2	After 3	After 4	After 5	After 6	After 7	After 8	After 9	After 10	Final
i	undefined	1	2	3	4	5	6	7	8	9	10	undefined

Key Moments - 2 Insights

Why does the loop stop after printing 10?

Because the range {1..10} only includes numbers from 1 to 10. After 10, there are no more numbers to pick, so the loop ends as shown in the last row of the execution_table.

What happens if you change {1..10} to {3..5}?

The loop will only run for i=3, 4, and 5. The execution_table would have only three iterations instead of ten.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of i at iteration 5?

A 6

B 5

C 4

D 10

💡 Hint

Check the 'i value' column in the execution_table at iteration 5.

At which iteration does the loop stop running?

A After iteration 9

B After iteration 1

C After iteration 10

D It never stops

💡 Hint

Look at the exit_note and the last row of the execution_table.

If the range changes to {1..3}, how many iterations will the loop run?

A 3

B 10

C 1

D 0

💡 Hint

The range {1..3} means numbers 1, 2, and 3 only, so check the variable_tracker for how many values i takes.

Concept Snapshot

for i in {start..end}; do
  commands using $i
 done

- Loops over numbers from start to end
- Runs commands once per number
- Stops after last number
- Simple way to repeat tasks with numbers

Full Transcript

This visual execution shows how a bash for loop with a range {1..10} works. The loop picks each number from 1 to 10 in order. For each number, it runs the commands inside the loop body. Here, it prints the number. The execution table lists each iteration with the current value of i and the output. The variable tracker shows how i changes from undefined to 1, then 2, up to 10, then back to undefined after the loop ends. Key moments explain why the loop stops after 10 and what happens if the range changes. The quiz questions test understanding of the loop variable values, when the loop stops, and how changing the range affects iterations.