This is a compilation of solutions for Flex Your Brain exercises appearing at the end of each chapter in the book UNIX Concepts and Applications - Fourth Edition (ISBN-13: 978-0-07-063546-3). The book is authored by Sumitabha Das and is published in India by McGraw-Hill Education.

This book is a recommended reading for many Computer Applications and Information Technology courses across India. It is also quite popular among students who are UNIX/Linux newbies.

The questions covered under Flex Your Brain exercises are slightly difficult to solve, and the answers for the same are not provided in the book. This project aims to provide a study aid by compiling solutions for the same.

The exercises are solved on a computer running latest release of macOS Mojave, a POSIX compliant UNIX operating system with Bash 4.4 as the choice of shell.

Every effort has been made to ensure that the answers are correct and complete. It is advised to refer to the system provided documentation (in the form of man pages) as needed.

A copy of the book can be bought online from Amazon or Flipkart.

The following conventions are used in the solutions:

• Key Terms are shown in Bold.

• Command-line, expression and symbol are wrapped in backticks.

• File and path names are italicised.