ls is working now.

ls/.gitignore

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+ls
+ls.exe
+*.out

ls/Makefile

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+
+
+build:
+	go build .

ls/go.mod

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+module lcthw.dev/go/go-coreutils/ls
+
+go 1.25.3

ls/main.go

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+package main
+
+import (
+  "fmt"
+  "io/fs"
+  "path/filepath"
+  "flag"
+)
+
+func main() {
+	var recurse bool
+
+	flag.BoolVar(&recurse, "R", false, "recursive listing")
+	flag.Parse()
+
+	paths := flag.Args()
+
+	if len(paths) == 0 {
+		paths = append(paths, ".")
+	}
+
+	for _, what := range paths {
+		if flag.NArg() > 1 {
+			fmt.Printf("\n%s:\n", what)
+		}
+
+		filepath.WalkDir(what, func (path string, d fs.DirEntry, err error) error {
+			if path == what { return nil }
+
+			if d.IsDir() && recurse {
+				fmt.Printf("\n%s:\n", path)
+			} else if d.IsDir() {
+				fmt.Printf("%s\n", filepath.Base(path))
+				return fs.SkipDir
+			} else {
+				fmt.Printf("%s\n", filepath.Base(path))
+			}
+
+			return nil
+		})
+	}
+}