diff --git a/src/std_fns.rs b/src/std_fns.rs
index 5962e95..84693f0 100644
--- a/src/std_fns.rs
+++ b/src/std_fns.rs
@@ -1085,9 +1085,52 @@ pub fn from_properties(stack: &mut Stack) -> OError {
     Ok(())
 }
 
+pub fn list_files(stack: &mut Stack) -> OError {
+    require_on_stack!(dir, Str, stack, "list-files");
+    stack.push(
+        match fs::read_dir(&dir)
+            .map_err(|_| stack.error(ErrorKind::IO(format!("Not a directory: {}", &dir))))
+        {
+            Ok(it) => Value::Array(
+                it.filter(|x| x.is_ok())
+                    .map(|x| {
+                        if let Ok(x) = x {
+                            Value::Str(x.file_name().to_string_lossy().into_owned()).spl()
+                        } else {
+                            unreachable!()
+                        }
+                    })
+                    .collect(),
+            )
+            .spl(),
+            Err(_) => Value::Null.spl(),
+        },
+    );
+    Ok(())
+}
+
+pub fn delete_file(stack: &mut Stack) -> OError {
+    require_on_stack!(file, Str, stack, "delete-file");
+    stack.push(Value::Int(if fs::remove_file(file).is_ok() { 1 } else { 0 }).spl());
+    Ok(())
+}
+
+pub fn delete_dir(stack: &mut Stack) -> OError {
+    require_on_stack!(dir, Str, stack, "delete-dir");
+    stack.push(
+        Value::Int(if fs::remove_dir_all(dir).is_ok() {
+            1
+        } else {
+            0
+        })
+        .spl(),
+    );
+    Ok(())
+}
+
 pub fn register(r: &mut Stack, o: Arc<Frame>) {
     type Fn = fn(&mut Stack) -> OError;
-    let fns: [(&str, Fn, u32); 65] = [
+    let fns: [(&str, Fn, u32); 68] = [
         ("pop", pop, 0),
         ("dup", dup, 2),
         ("dup2", dup2, 3),
@@ -1153,6 +1196,9 @@ pub fn register(r: &mut Stack, o: Arc<Frame>) {
         ("mega-to-str-radix", mega_to_str_radix, 1),
         ("properties", properties, 1),
         ("from-properties", from_properties, 1),
+        ("list-files", list_files, 1),
+        ("delete-file", delete_file, 1),
+        ("delete-dir", delete_dir, 1),
     ];
     for f in fns {
         r.define_func(