probe-file (Function)

Syntax:

Arguments and Values:

pathspec—a pathname designator.

truename—a physical pathname or nil.

Description:

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.

Affected By:

The host computer's file system.

Exceptional Situations:

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.

See Also:

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