How to Install and Uninstall flex on Ubuntu 22.04

Updated: August 30, 2022

Flex is a tool for generating scanners: programs which recognized lexical patterns in text. It reads the given input files for a description of a scanner to generate. The description is in the form of pairs of regular expressions and C code, called rules. Flex generates as output a C source file, lex.yy.c, which defines a routine yylex(). This file is compiled and linked with the -lfl library to produce an executable. When the executable is run, it analyzes its input for occurrences of the regular expressions. Whenever it finds one, it executes the corresponding C code. In this tutorial, I will show you ways to install flex Ubuntu 22.04.

Requirements

  • OS: Ubuntu 22.04 or older versions with more than 2GB RAM
  • Privileges: Verify that you can execute the sudo commands line.

Prerequisites to install flex on Ubuntu 22.04

Install flex Ubuntu 22.04

flex is one of the popular ways on Ubuntu now so that this tutorial will show you some ways to install it. Choose the one that you think is easy and you can follow.

Install flex using APT

This is one of the most popular methods for installing Ubuntu packages because it’s easy to follow, even if you are a newbie in Linux. Following these steps to get flex on your Ubuntu 22.04.

Step 1: You must update the APT package repository cache before attempting to install, update, or remove any packages. Update the APT database to download new packages from Ubuntu. Opening the terminal and executing the following Linux command:

sudo apt-get -y update

Step 2: Start the package installation on Ubuntu 22.04. After updating, you can install flex Ubuntu by executing this command in the terminal.

sudo apt-get install flex

Install flex using Aptitude

Aptitude allows users to view a list of available packages and manage package installation, upgrade, and removal. If you haven’t already installed it on Ubuntu, run this command to do so.

sudo apt -y install aptitude

Then, you can now install flex by following these steps:

Step 1: The APT package repository cache needs to be updated before you try to install, update, or remove any packages. Obtain new packages from Ubuntu by updating the APT database. Opening the terminal and executing this Linux command:

sudo apt-get update

Step 2: Start installing the packages on Ubuntu 22.04. You can now install flex Ubuntu by executing this command in the terminal.

sudo aptitude install flex

Uninstall flex on Ubuntu 22.04

Have you ever thought about how difficult it is to uninstall an application from Ubuntu? You are mistaken; anyone can easily uninstall any program, not just a package.

If you installed flex using APT or Aptitude, you could uninstall flex on Ubuntu by executing this command

sudo apt remove --auto-remove flex

To uninstall flex and remove its data and dependencies, you can also use the following command:

sudo apt autoremove --purge flex

Ending

In this guide, I showed you ways to install flex on Ubuntu 22.04 and ways to uninstall flex too. Please do not hesitate to contact me if you require any assistance. I’m delighted to respond to them.