Commands

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

• system(Command,Status): Sends Command to the OS, and binds Status to the status that is returned from the OS.

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

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

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

• date(Date): Assume that 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, except that environment variables are replaced by their definitions.

• copy_file(Name,NameCp): Copies a file.

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

• delete_file(Name): Deletes a file.

• directory_exists(Name): Determines whether a directory with the name Name exists.

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

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

• file_directory_name(Name,Dir): Dir is the directory that contains the file named Name.

• file_exists(Name): Determines whether a file with the name Name exists.

• file_property(Name,Property): The file or directory with the name Name has the property Property, where Property is one of the following:
  • type(Value): 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 most recent 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)
  

  Refer to the C language manual for the meanings of these arguments.

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

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

• working_directory(Name): This is the same as get_cwd(Name).