GNU Emacs Lisp Reference Manual
25.8.3 Absolute and Relative File Names
All the directories in the file system form a tree starting at the
root directory. A file name can specify all the directory names
starting from the root of the tree; then it is called an absolute
file name. Or it can specify the position of the file in the tree
relative to a default directory; then it is called a relative file
name. On Unix and GNU/Linux, an absolute file name starts with a slash
or a tilde (`~'), and a relative one does not. On MS-DOS and
MS-Windows, an absolute file name starts with a slash or a backslash, or
with a drive specification `x:/', where x is the
drive letter. The rules on VMS are complicated.
- Function: file-name-absolute-p filename
- This function returns
t if file filename is an absolute
file name, nil otherwise. On VMS, this function understands both
Unix syntax and VMS syntax.
| | (file-name-absolute-p "~rms/foo")
=> t
(file-name-absolute-p "rms/foo")
=> nil
(file-name-absolute-p "/user/rms/foo")
=> t
|
