Warning! this library assumes we are in a POSIX compliant OS. It will not work properly under windows.
val root : string
The path of the root.

Pathname resolution

val realpath : string -> string
realpath path Raises Unix_error on errors.
Returns the canonicalized absolute pathname of path.
val is_posix_pathname_component : string -> bool
is_posix_pathname_component f Returns true if f is a valid filename in a POSIX compliant OS (a path component and not a full path).

http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap03.html#tag_03_169

temp_file ?perm ?in_dir_name prefix suffix

Returns the name of a fresh temporary file in the temporary directory. The base name of the temporary file is formed by concatenating prefix, then a 6-digit hex number, then suffix. The temporary file is created empty. The file is guaranteed to be fresh, i.e. not already existing in the directory.

in_dir : the directory in which to create the temporary file. The default is temp_dir_name
perm : the permission of the temporary file. The default value is 0o600 (readable and writable only by the file owner)

Note that prefix and suffix will be changed when necessary to make the final filename valid POSIX.

temp_dir is the same as temp_file but creates a temporary directory.

val temp_file : ?perm:int -> ?in_dir:string -> string -> string -> string
val temp_dir : ?perm:int -> ?in_dir:string -> string -> string -> string
val temp_dir_name : string
The name of the temporary directory:

Under Unix, the value of the TMPDIR environment variable, or "/tmp" if the variable is not set.

Under Windows, the value of the TEMP environment variable, or "." if the variable is not set.

val open_temp_file : ?perm:int -> ?in_dir:string -> string -> string -> string * out_channel
Same as Core_filename.temp_file, but returns both the name of a fresh temporary file, and an output channel opened (atomically) on this file. This function is more secure than temp_file: there is no risk that the temporary file will be modified (e.g. replaced by a symbolic link) before the program opens it.
val current_dir_name : string
The conventional name for the current directory (e.g. . in Unix).
val parent_dir_name : string
The conventional name for the parent of the current directory (e.g. .. in Unix).
val dir_sep : string
The directory separator (e.g. / in Unix).
val concat : string -> string -> string
concat p1 p2 returns a path equivalent to p1 ^ "/" ^ p2. In the resulting path p1 (resp. p2) has all its trailing (resp. leading) "." and "/" removed. eg: concat "a/." ".//b" => "a/b" concat "." "b" => "./b" concat "a" "." => "a/." concat "a" "/b" => "a/b"
val is_relative : string -> bool
Return true if the file name is relative to the current directory, false if it is absolute (i.e. in Unix, starts with /).
val is_absolute : string -> bool
val is_implicit : string -> bool
Return true if the file name is relative and does not start with an explicit reference to the current directory (./ or ../ in Unix), false if it starts with an explicit reference to the root directory or the current directory.
val check_suffix : string -> string -> bool
check_suffix name suff returns true if the filename name ends with the suffix suff.
val chop_suffix : string -> string -> string
chop_suffix name suff removes the suffix suff from the filename name. The behavior is undefined if name does not end with the suffix suff.
val chop_extension : string -> string
Return the given file name without its extension. The extension is the shortest suffix starting with a period and not including a directory separator, .xyz for instance.

Raise Invalid_argument if the given name does not contain an extension.

val split_extension : string -> string * string option
split_extension fn return the portion of the filename before the extension and the (optional) extension. Example: split_extension "/foo/my_file" = ("/foo/my_file", None) split_extension "/foo/my_file.txt" = ("/foo/my_file", Some "txt") split_extension "/home/c.falls/my_file" = ("/home/c.falls/my_file", None)
val basename : string -> string
Respects the posix semantic.

Split a file name into directory name / base file name. concat (dirname name) (basename name) returns a file name which is equivalent to name. Moreover, after setting the current directory to dirname name (with Sys.chdir), references to basename name (which is a relative file name) designate the same file as name before the call to Sys.chdir.

The result is not specified if the argument is not a valid file name (for example, under Unix if there is a NUL character in the string).

val dirname : string -> string
See Filename.basename.
val split : string -> string * string
split filename returns (dirname filename, basename filename)
val parts : string -> string list
parts filename returns a list of path components in order. For instance: /tmp/foo/bar/baz -> "/"; "tmp"; "foo"; "bar"; "baz"
val quote : string -> string
Return a quoted version of a file name, suitable for use as one argument in a command line, escaping all meta-characters. Warning: under Windows, the output is only suitable for use with programs that follow the standard Windows quoting conventions.