add filesystem cookbook

data/cookbook/file-system/00-stdlib.ml

@@ -0,0 +1,26 @@
+---
+packages: []
+discussion: |
+  - **Reference:** All the presented functions are available in the [Sys module reference](https://v2.ocaml.org/api/Stdlib.Sys.html)
+---
+(* Testing the presence of a file/directory *)
+let () = if Sys.file_exists "my_file" then
+                 print_string "The file/directory exists."
+(* Testing if file or directory which exists is a directory. *)
+let () = if Sys.is_directory "my_file" then
+                 print_string "It is a directory."
+               else
+                 print_string "It is a file (regular or not)."
+(* Deleting a file *)
+let () = Sys.remove "my_file"
+(* Renaming a file *)
+      let () = Sys.rename "my_file" "new_name"
+(* Changing the current directory *)
+      let () = Sys.chdir "new_directory_path"
+(* Deleting a directory *)
+      let () = Sys.rmdir "directory_name"
+(* Listing a directory *)
+      let () =
+        let file_array = Sys.readdir "directory_name" in
+        Array.iter (fun filename -> Printf.printf "%s\n" filename) file_array
+

data/cookbook/tasks.yml

@@ -8,6 +8,10 @@ categories:
     description: >
       Use ANSI escape codes for cursor location, font and colour in video text
       terminal emulators.
+- title: File System
+  tasks:
+  - title: Miscellaneous File System Operations
+    slug: file-system
 - title: Compilation & Linking
   tasks:
   - title: Compile and Link to a Bundled C Library