alex command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

alex: command not found

or when using sudo you get the following error message

sudo: alex: command not found

Solutions to alex: command not found

How To Fix alex: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu alex is provided by alex package.

alex is:

Alex is a tool for generating lexical analysers in Haskell, given a description of the tokens to be recognised in the form of regular expressions. It is similar to the tool lex or flex for C/C++.

To fix this problem, we can install more using the command below.

sudo apt-get -y install alex

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install alex.

sudo apt -y install alex

Or if you have aptitude installed you can use the following command.

sudo aptitude install alex

Summary

In this tutorial we learn how to fix alex command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.