Installing LEX && YACC packages in Ubuntu

This article will tell you how to install LEX and YACC packages in your Ubuntu or any Linux based Operating system.

PREREQUISITES

• A PC installed with Ubuntu or any Linux based OS.(You can also be running Ubuntu as a virtual machine using VMWare/VirtualBox in Windows OS.

[See: "How to install Ubuntu as a virtual machine using VMWare player in Windows"]

• A working internet connection. (connect your PC to the Internet before you begin).

STEPS:
#To run Lex programs (.l extension) you need to install either 'flex' or 'flex-old' package.
#To run Yacc programs (.y extension) you need to install 'bison' package.

• Open the 'Terminal' in Linux OS by searching 'Terminal' in the search bar.

Step 1) To install Lex package:
Type the exact command (either of the two)

• sudo apt-get install flex
• sudo apt-get install flex-old

Type 'y' when it asks for confirmation (see image below)

Step 2) To install Yacc package:

Type the exact command

• sudo apt-get install bison

Type 'y' when it asks for confirmation (see image below)

NOTE: You may face a 'Candidate Key not Found' Error while performing step 1 & 2.

solution for Candidate Key not Found error is updating the 'APT' database of Linux. Type this command:

• sudo apt-get update

See image:

Once this gets completed, follow steps 1 & 2 for installing lex and Yacc packages.

That's it. Now you can execute Lex and Yacc programs in your Linux.

Comment below for any queries so that i can get back to you via replies. Cheers!

Author : Unknown

He is a simple passionate tech freak who himself is an engineering student at Canara Engineering college. He likes App Development, Web designing, Blogging, Youtubing, Debugging and also is a CodeGeek!

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