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  \file{~} will never be considered for deletion.
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  \file{~} will never be considered for deletion.
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#ifdef unix
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#ifdef unix
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  Wildcards will only be expanded if the system supports it.  Most
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  Wildcards will only be expanded if the system supports it.  Most
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  systems will support not only \file{*} and \file{?} but also character
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  systems will support not only \file{*} and \file{?} but also character
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  classes such as \file{[a-z]} (see the \command{man} pages for the system
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  classes such as \file{[a-z]} (see the \command{man} pages for the system
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  call \code{glob} on your OS).  The metacharacters \code{* ? [} can
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  call \code{glob} on your OS).  The metacharacters \samp{* ? [} can
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  occur in Unix filenames, and this makes it difficult to use
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  occur in Unix filenames, and this makes it difficult to use
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  \code{unlink} to delete such files (see \code{\link{file.remove}}),
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  \code{unlink} to delete such files (see \code{\link{file.remove}}),
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  although escaping the metacharacters by backslashes usually works.  If
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  although escaping the metacharacters by backslashes usually works.  If
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  a metacharacter matches nothing it is considered as a literal
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  a metacharacter matches nothing it is considered as a literal
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  character.
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  character.