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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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Evil twins

We already mentioned evil twins in Chapter 4, so why mention them again when speaking of merging?

The answer is that one cannot (easily) merge evil twins. Merging, contrarily to patching, concerns versions of the same element, and evil twins are precisely different elements.

The fact is that evil twins are for this reason often detected while merging, and more specifically, while merging whole directory trees. It comes as a surprise to many users that findmerge will fail to find suitable contributors, a situation they may show you with a screen dump but cannot explain.

It must be said that it is our experience that evil twins are more frequently produced by Windows GUI users than by command line UNIX ones. The reason is that the GUI puts ...

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