How To Install LEX and YACC in Linux or Ubuntu

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To program LEX programs and yacc programs you need to install two packages in Ubuntu

 1:Flex -to make the Lex program work
2.Bison -to make the yacc programs work
To install,Open terminal and do the following... 
1.To install Flex

 sudo apt-get upgrade
sudo apt-get install flex

 2.To install Lex
sudo apt-get upgrade
sudo apt-get install bison

 And its done ..!!!

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