lex and yacc for Ubuntu

Ubuntu by default does not have lex and yacc installed. Here is the simplest way to install lex and yacc in Ubuntu. This method uses the following packages

flex (for lex)

bison (for yacc)

Open a terminal and type the following command

sudo apt-get install flex bison

After the installation type the following two commands on the console.

which lex

which yacc

They should return /usr/bin/lex and /usr/bin/yacc respectively if lex and yacc

installed properly