Variables Perl In Quotes

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If you think “constant variable” sounds a little oxymoronic, just remember that it’s in good company: virtual reality, advanced BASIC, readable Perl and internet security.
Jonathan Sande & Matt Galloway (Dart Apprentice: Beginning Programming with Dart)
To base64-encode the whole file, use this: perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' file Here, the -0777 argument together with -n causes Perl to slurp the whole file into the $_ variable. Next, the file is base64-encoded and printed. (If Perl didn’t slurp the entire file, it would be encoded line by line, and you’d end up with a mess.)
Peteris Krumins (Perl One-Liners: 130 Programs That Get Things Done)
Used for code listings and for keywords, variables, function names, command options, parameters,
Sean M. Burke (Perl & LWP: Fetching Web Pages, Parsing HTML, Writing Spiders & More)