Commands

• system(Command): Send Command to the OS.

• system(Command,Status): Send Command to the OS and bind Status to the status returned from the OS.

• chdir(Atom):
• cd(Atom): Change the current working directory to Atom.

• get_cwd(Dir):
• getcwd(Dir): Bind Dir to the current working directory.

• date(Y,M,D): The current date is Y year, M month, and D day.

• date(Date): Assume the current date is Y year, M month, and D day. Then Date is unified with the term date(Y,M,D).

• time(H,M,S): The current time is H hour, M minute, and S second.

• get_environment(EVar,EValue):
• environ(EVar,EValue): The environment variable EVar has the value EValue.

• expand_environment(Name,FullName): FullName is a copy of Name with environment variables replaced with their definitions. FullFile is a copy of Name with environment variables replaced with their definitions.

• copy_file(Name,NameCp): Make a copy of a file.

• delete_directory(Name): Delete the directory named Name if it exists.

• delete_file(Name): Delete a file.

• directory_exists(Name): Test if a directory with the Name exists.

• directory_files(Name,List): List is the list of all files in some undefined order in the directory named Name.

• file_base_name(Name,Base): Base is the base name of the file named Name.

• file_directory_name(Name,Dir): Dir is the directory of a file named Name.

• file_exists(Name): Test if a file with the Name exists.

• file_property(Name,Property): The file or directory with the Name has the Property, where Property is one of the following:
  • type(Value) where Value is one of the following: regular,directory, symbolic_link, fifo, and socket.
  • access_time(Value): Value is the latest access time.
  • modification_time(Value): Value is the latest modification time.
  • status_change_time(Value): Value is the time of the last file status change.
  • size(Value): Value is the size of the file in bytes.
  • permission(Value): Value is one of the following: read, write, and execute.

• file_stat(Name,Property): This predicate calls the C function stat and unifies Property with a structure of the following form:

       stat(St_dev,St_ino,St_mode,St_nlink,St_uid,St_gid,
            St_rdev,St_size,St_atime,St_mtime,St_ctime)
  

  The reader is referred to the C language manual for the meanings of these arguments.

• make_directory(Name): Create a new directory named Name.

• rename_file(OldName,NewName): Rename the file named OldName into NewName.

• working_directory(Name): Same as get_cwd(Name).