in reply to in memory files in 5.6.1
To create a "RAM based directory" is more of a task for an operating-system than a program. Really, you'd need to mount a new type of file-system (there may be support for some existing RAM-disk-based file-system in your OS or not).
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What you have the option of doing inside your program is to not go to the file-system at all, which is what various perl constructs such as IO::Scalar and the similar builtin functionality in 5.8 do.
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In Section
Seekers of Perl Wisdom