sometimes duplicates are added to sources.list file cause errors while using apt-get. code for checking duplicates in sources.list and remove them

Who this book is for This book is intended for software developers, researchers, and students who are already familiar with the basic concepts of OpenSceneGraph and can write simple programs with it. A basic knowledge of C++ programming is also exp

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介绍了如何将Visual Basic与Excel两种不同的应用系统有机地结合在一起,充分利用两者 的优势,开发出简单易用的报表处理软件. -In this paper,the authors introduce the method of howto combine the two different applied softwaresVisual Basic and Excel andmake good use oftheir advantages so as to develop