For me, perl's killer app these days is the one-liner. Where python has (for me, at least) muscled in on perl's niche as general-scripting-language-of-choice,

For me, perl's killer app these days is the one-liner. Where python has (for me, at least) muscled in on perl's niche as general-scripting-language-of-choice, perl remains unmatched as the most terrifyingly useful extension to the command-line that ever there was.