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Predicate read_link/3
Availability:built-in
read_link(+File, -Link, -Target)
If File points to a symbolic link, unify Link with the value of the link and Target to the file the link is pointing to. Target points to a file, directory or non-existing entry in the file system, but never to a link. Fails if File is not a link. Fails always on systems that do not support symbolic links.
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