for loop with range ({1..10}) in Bash Scripting

Introduction

A for loop with a range lets you repeat commands a set number of times easily.

When you want to run a task 10 times in a row.

When you need to process files numbered from 1 to 10.

When you want to print numbers from 1 to 10.

When automating repetitive steps in a script.

When counting or iterating over a fixed sequence of numbers.

Syntax

Bash Scripting

for i in {1..10}
do
  commands using $i
 done

The numbers inside {1..10} define the start and end of the range.

Each loop step sets variable i to the next number in the range.

Examples

Prints numbers 1 to 5 with the word 'Number' before each.

Bash Scripting

for i in {1..5}
do
  echo "Number $i"
done

Counts down from 10 to 1.

Bash Scripting

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

Prints even numbers from 2 to 8 using a step of 2.

Bash Scripting

for i in {2..8..2}
do
  echo $i
done

Sample Program

This script counts from 1 to 10 and prints each number with 'Counting:'.

Bash Scripting

#!/bin/bash
for i in {1..10}
do
  echo "Counting: $i"
done

Important Notes

Make sure to use double quotes around variables to avoid word splitting.

The range {1..10} works in Bash version 3 and above.

You can change the step by adding a third number like {1..10..2}.

Summary

Use for loops with {start..end} to repeat commands over a number range.

The loop variable changes each time from start to end.

You can customize the range and step size easily.