Built-in Operations on Files
The following operations on files are described in the reference pages.
takes a filename RelFileName (typically typed in by the user of a
program) and unifies it with the normalized AbsFileName.
absolute_file_name/2 mimics the filename resolution done
by commands such as
compile/1. It is meant primarily
for looking up Prolog
source files. If you want to find the absolute filename of any
absolute_file_name/2 may not be appropriate.
file_member_of_directory/2 in lib-lfi-fdi.
if FileNameOrStream is an atom, it refers to a DEC-10-compatible
stream connected to the file of that name; otherwise it is a stream
object. In either case, the associated stream is closed.
is true if Stream is a stream connected to file AbsFileName, and
currently open in mode Mode.
current_stream/2 can be used to list
currently open streams and the files to which they are connected.
unifies Directory with an entry from the
user-modifiable table of directories to be searched for library
opens a new Stream connected to the file named by FileName.
If Mode is
append) it will (may) create a new file.
opens the file or stream FileNameOrStream for input if it is not already open.
opens the file or stream FileNameOrStream for output if it is
not already open.
selects Directory as the default directory for relative file names.
This is also known as the current working directory.
To find out what the default directory currently is, type
| ?- absolute_file_name(., CurrentDirectory).