Install flex on Ubuntu: sudo apt-get install flex
Learn how to install flex with the command sudo apt-get install flex on Ubuntus.
Quick installation of flex:
Step 1: Update system:
sudo apt-get update
Step 2: Install: flex
Ater updaing the OS run following command to install the packae:
sudo apt-get install flex
Package Details | |
| Package: | flex |
| Version: | 2.5.35-10ubuntu3 |
| Maintainer: | Ubuntu Developers |
| Home page: | http://flex.sf.net/ |
| Description: | A fast lexical analyzer generator. 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. Multi-Arch: foreign Homepage: http://flex.sf.net/ |
| Distro: | Ubuntu 12.04 LTS |
| Release: | |
| Repo/Section: | devel |
How to install flex on Ubuntu 12.04 LTS?
First of all update your system with the command:
sudo apt-get update
Above command will download the package lists for Ubuntu 12.04 LTS on your system. This will update the list of newest versions of packages and its dependencies on your system.
After downloading the latest package list with the help of above you can run the installation process.
If flex is not installed on your compter then the command 'dpkg -L flex' will give followin error.
deepak@deepak-VirtualBox:~$ dpkg -L flex Package `flex' is not installed. Use dpkg --info (= dpkg-deb --info) to examine archive files, and dpkg --contents (= dpkg-deb --contents) to list their contents. deepak@deepak-VirtualBox:~$
Installing flex:
After system update use the following command to install flex:
sudo apt-get install flex
Above command will confirm before installing the package on your Ubuntu 12.04 LTS Operating System. If you are not already logged in as su, installer will ask you the root password. After completion of the installation you can use the package on your system.
How to uninstall/remove flex from Ubuntu 12.04 LTS?
Now we will see the commands for uninstalling the flex from Ubuntu 12.04 LTS. For uninstalling this package you can easily use the apt command and remove the package from Linux Operating System.
To remove the flex following command is used:
sudo apt-get remove flex
Following command is used to remove the flex package along with its dependencies:
sudo apt-get remove --auto-remove flex
This will remove flex and all its dependent packages which is no longer needed in the system.
Completely removing flex with all configuration files:
Following command should be used with care as it deletes all the configuration files and data:
sudo apt-get purge flex
or you can use following command also:
sudo apt-get purge --auto-remove flex
Above command will remove all the configuration files and data associated with flex package. You can can't recover the delete data, so, use this command with care.