7.5 The Load Facility

7.5.1 Specifying pathnames

• If you specify a:directory keyword argument to the Common Lisp functionmake-pathname, you must specify absolute or relative pathnames by using the symbol:root or the symbol:relative.

To make an absolute pathname, specify the symbol:root at the front of the list that is given for the keyword:directory:

(make-pathname :directory '(:ROOT "u" "jones"))

To make a relative pathname, specify the symbol:relative at the front of the directories list:

(make-pathname :directory '(:RELATIVE "jones"))

• The Common Lisp functionmerge-pathnames handles relative pathnames, as the following example demonstrates:

> *default-pathname-defaults* 
#P"/etc/" 

> (merge-pathnames "subdir")
#P"/etc/subdir"

• You can specify a host field as part of a pathname, but this information is not used.

> (make-pathname :host "edsel" :name "getty" :directory 
                                       '(:root "usr"))
#P"/usr/getty"

• The Common Lisp function directory accepts the keyword extension:sorted, which can have one of two values:

If the value ist, the functionpathname-lessp is used to sort the list of pathnames. This value is the default.

If the value isnil, the list is not sorted.

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