Add to your bag of tricks several handy techniques for crafting real-world regular expressions (regexps). Building regexps is a part of the daily life of any administrator. Learning to think in terms of pattern matching, in order to construct successful regexps that return the desired criteria, is a skill that takes both time and practice. 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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