Green computing or clean computing is necessary for Software Engineering. Perl and Python are important programming languages for green computing. Perl is regular language. Perl is mainly used for server-side programming because it is a regular language. It a portable and green programming language. It can be used as object-oriented (OO) or non objectoriented (Non-O-O) programming language. Python is preprocessor. It is a portable language for software engineering. It has an import feature for Green computing.