ANSI Common Lisp   22 Printer   22.1 The Lisp Printer   22.1.3 Default Print-Object Methods

22.1.3.11 Printing Pathnames

When printer escaping is enabled, the syntax #P"..." is how a pathname is printed by write and the other functions herein described. The "..." is the namestring representation of the pathname.

When printer escaping is disabled, write writes a pathname P by writing (namestring P) instead.

For information on how the Lisp reader parses pathnames, see Section 2.4.8.14 Sharpsign P.