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A key element of gaining proficiency in any programming language involves the ability to work with files and file systems. The level of difficulty in working with files varies from very easy to hard, depending on the programming language concerned. The C programming language, on which Objective-C is based, tended to make file handling a little hard relative to the standards of today's programmer friendly object oriented languages. The good news for Objective-C developers is that the Foundation Framework includes a number of classes designed specifically to make the task of working with files and directories as straightforward as possible.

POSIX Permissions 493

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