Under the hood, Perl's sort() function uses the quicksort algorithm, which we'll describe later in the chapter. This is a standard sorting algorithm, provided by most operating systems as qsort(3).* In Versions 5.004_05 and higher, Perl uses its own quicksort implementation instead of the one provided by the operating system. more...
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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