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IBM Rational ClearCase 7.0: Master the Tools That Monitor, Analyze, and Manage Software Configurations by Tatiana Shpichko, Marc Girod

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Checkout and checkin

Elements under ClearCase are fully accessible (but read-only) as checked in, e.g. to tools such as compilers. Checking out implies thus in general terms an intention to modify an element (we'll discuss later in this chapter the special case of tools requiring that some files be kept writable). A version checked out becomes a view-private file and is not shared with others (unless via a view-extended path) until it's checked in. This is why checking out is at best deferred as late as possible, and also done on a file basis, as needed. In the same way, checking in should happen as soon as possible, as it provides a fine-grain backup: it is easily decoupled from delivery to others. The set of checked out files should therefore ...

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