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document {
Key => fileExists,
Headline => "whether a file exists",
Usage => "fileExists fn",
Inputs => { "fn" => String },
Outputs => { Boolean => { "whether a file with the filename or path ", TT "fn", " exists" }},
EXAMPLE lines ///
fn = temporaryFileName()
fileExists fn
fn << "hi there" << close
fileExists fn
removeFile fn
///,
"If ", TT "fn", " refers to a symbolic link, then whether the file exists is determined by the content of the link and whether there is
a file with the new path determined by it. The presence of a symbolic link can be detected with ", TO "readlink", "."
}
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