updates

kernel/bin/dirname

@@ -0,0 +1,19 @@
+/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
+function bareStdin(ctx) {
+  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
+}
+
+async function run(ctx, argv) {
+  const parts = argv.slice(1).filter((a) => a !== '--')
+  if (!parts.length) {
+    ctx.console.error('dirname: missing operand')
+    return
+  }
+  for (const path of parts) {
+    const cleaned = path.replace(/\/+$/, '') || '/'
+    const i = cleaned.lastIndexOf('/')
+    const out =
+      i <= 0 ? (cleaned[0] === '/' ? '/' : '.') : cleaned.slice(0, i) || '/'
+    ctx.console.log(out)
+  }
+}