Linux is full of small features that can dramatically improve your productivity once you discover them. One of those features is brace expansion.

Many Linux users know commands like mkdir, touch, or cp, but surprisingly few people realize how powerful these commands become when combined with brace expansion. Even experienced system administrators often overlook this simple but extremely powerful feature.

In this article, we will explore:

  • What brace expansion is
  • How it works
  • Practical examples using mkdir
  • Real-world use cases
  • Why every Linux user should know this trick

What is Brace Expansion?

Brace expansion is a feature built into most Unix shells such as Bash and Zsh. It allows you to generate multiple strings from a single expression.

Instead of writing the same command repeatedly, you can let the shell generate the variations automatically.

Example:


echo file{1,2,3}.txt