probe-file pathspec → truename

pathspec — a pathname designator.

truename — a physical pathname or nil.

probe-file tests whether a file exists.

probe-file returns false if there is no file named pathspec, and otherwise returns the truename of pathspec.

If the pathspec designator is an open stream, then probe-file produces the truename of its associated file. If pathspec is a stream, whether open or closed, it is coerced to a pathname as if by the function pathname.

The host computer’s file system.

An error of type file-error is signaled if pathspec is wild.

An error of type file-error is signaled if the file system cannot perform the requested operation.

truename, open, ensure-directories-exist, pathname, logical-pathname, Section 20.1 (File System Concepts), Section 21.1.1.1.2 (Open and Closed Streams), Section 19.1.2 (Pathnames as Filenames)