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...lde then it will try to open this filename without any preceding modification. So the tilde expansion is not really a unix idiom. It is rather an idiom of its unix shells like bash. But beware, the bash treats the tilde as home path not in all cases. Inside of quotes the tilde keeps unaltered. So bedides any cenvenience functionality which can lead to failing code the bash has a very clean way to access files in a unique way. And here is the problem wirh R. The R shell has no quoting mechanism for this use case. It provides the tilde expansion after a string has been defined. In the bash it is...