How To Install flex-doc on Ubuntu 22.04
Introduction
In this tutorial we learn how to install flex-doc on Ubuntu 22.04.
What is flex-doc
flex-doc is:
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.
This package contains the HTML documentation for flex.
There are three methods to install flex-doc on Ubuntu 22.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install flex-doc Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install flex-doc using apt-get by running the following command:
sudo apt-get -y install flex-doc
Install flex-doc Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install flex-doc using apt by running the following command:
sudo apt -y install flex-doc
Install flex-doc Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install flex-doc using aptitude by running the following command:
sudo aptitude -y install flex-doc
How To Uninstall flex-doc on Ubuntu 22.04
To uninstall only the flex-doc package we can use the following command:
sudo apt-get remove flex-doc
Uninstall flex-doc And Its Dependencies
To uninstall flex-doc and its dependencies that are no longer needed by Ubuntu 22.04, we can use the command below:
sudo apt-get -y autoremove flex-doc
Remove flex-doc Configurations and Data
To remove flex-doc configuration and data from Ubuntu 22.04 we can use the following command:
sudo apt-get -y purge flex-doc
Remove flex-doc configuration, data, and all of its dependencies
We can use the following command to remove flex-doc configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge flex-doc
References
Summary
In this tutorial we learn how to install flex-doc package on Ubuntu 22.04 using different package management tools: apt, apt-get and aptitude.
