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How would you like to determine which line would be replaced? &nbsp;Are you searching by line number or trying to match a string?
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what is the easiest way to search and replace a line in a file using perl 
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what is the easiest way to search and replace a line in a file using perl 

How would you like to determine which line would be replaced?  Are you searching by line number or trying to match a string?

replace

Perl is a high-level, general-purpose, interpreted, dynamic programming languages with over 25 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.  Perl gained widespread popularity as a Common Gateway Interface (CGI) scripting language, in part due to its regular expression and string parsing abilities. In addition to CGI, Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.