Returns the truename of a pathname.
truename filespec => truename
A pathname designator.
A fully-specified physical pathname.
truename behaves as specified in ANSI Common Lisp. The returned value is a fully-specified pathname.
Truenames are always fully-specified in LispWorks (this prevents them from ever being corrupted by
*default-pathname-defaults*). Note that this means that the paths returned by directory are always fully specified.
LispWorks User Guide and Reference Manual - 20 Sep 2017