How To Install flex-old on Ubuntu 22.04
Introduction
In this tutorial we learn how to install flex-old
on Ubuntu 22.04.
What is flex-old
flex-old is:
flex is a tool for generating scanners: programs which recognize lexical patterns in text. This is the old 2.5.4a version, which is no longer being developed. You should normally choose flex, unless you have legacy lexer files that do not work with a modern flex.
This product includes software developed by the University of California, Berkeley and its contributors. The upstream source code can be found at http://flex.sourceforge.net/
There are three methods to install flex-old
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-old 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-old
using apt-get
by running the following command:
sudo apt-get -y install flex-old
Install flex-old Using apt
Update apt database with apt
using the following command.
sudo apt update
After updating apt database, We can install flex-old
using apt
by running the following command:
sudo apt -y install flex-old
Install flex-old 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-old
using aptitude
by running the following command:
sudo aptitude -y install flex-old
How To Uninstall flex-old on Ubuntu 22.04
To uninstall only the flex-old
package we can use the following command:
sudo apt-get remove flex-old
Uninstall flex-old And Its Dependencies
To uninstall flex-old
and its dependencies that are no longer needed by Ubuntu 22.04, we can use the command below:
sudo apt-get -y autoremove flex-old
Remove flex-old Configurations and Data
To remove flex-old
configuration and data from Ubuntu 22.04 we can use the following command:
sudo apt-get -y purge flex-old
Remove flex-old configuration, data, and all of its dependencies
We can use the following command to remove flex-old
configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge flex-old
References
Summary
In this tutorial we learn how to install flex-old
package on Ubuntu 22.04 using different package management tools: apt
, apt-get
and aptitude
.