diff --git a/mod.test.ts b/mod.test.ts
index 4ffbead..7d1de9f 100644
--- a/mod.test.ts
+++ b/mod.test.ts
@@ -1,5 +1,5 @@
 import $, { build$, CommandBuilder, CommandContext, CommandHandler } from "./mod.ts";
-import { assertEquals, assertRejects, assertThrows } from "./src/deps.test.ts";
+import { assert, assertEquals, assertRejects, assertThrows } from "./src/deps.test.ts";
 import { Buffer, colors, path } from "./src/deps.ts";
 
 Deno.test("should get stdout when piped", async () => {
@@ -749,3 +749,33 @@ async function withTempDir(action: (path: string) => Promise<void>) {
     }
   }
 }
+
+Deno.test("test mkdir", async () => {
+  await withTempDir(async (dir) => {
+    await $`mkdir ${dir}/a`;
+    await $.exists(dir + "/a");
+
+    {
+      const error = await $`mkdir ${dir}/a`.noThrow().stderr("piped").spawn()
+        .then(
+          (r) => r.stderr,
+        );
+      const expecteError = "mkdir: cannot create directory";
+      assertEquals(error.slice(0, expecteError.length), expecteError);
+    }
+
+    {
+      const error = await $`mkdir ${dir}/b/c`.noThrow().stderr("piped").spawn()
+        .then(
+          (r) => r.stderr,
+        );
+      const expectedError = Deno.build.os === "windows"
+        ? "mkdir: The system cannot find the path specified."
+        : "mkdir: No such file or directory";
+      assertEquals(error.slice(0, expectedError.length), expectedError);
+    }
+
+    await $`mkdir -p ${dir}/b/c`;
+    assert(await $.exists(dir + "/b/c"));
+  });
+});
diff --git a/src/command.ts b/src/command.ts
index 29eb963..b044d78 100644
--- a/src/command.ts
+++ b/src/command.ts
@@ -3,6 +3,7 @@ import { cdCommand } from "./commands/cd.ts";
 import { echoCommand } from "./commands/echo.ts";
 import { exitCommand } from "./commands/exit.ts";
 import { exportCommand } from "./commands/export.ts";
+import { mkdirCommand } from "./commands/mkdir.ts";
 import { rmCommand } from "./commands/rm.ts";
 import { sleepCommand } from "./commands/sleep.ts";
 import { testCommand } from "./commands/test.ts";
@@ -45,6 +46,7 @@ const builtInCommands = {
   sleep: sleepCommand,
   test: testCommand,
   rm: rmCommand,
+  mkdir: mkdirCommand,
 };
 
 /**
diff --git a/src/commands/args.ts b/src/commands/args.ts
index 6a83c9e..0daa67d 100644
--- a/src/commands/args.ts
+++ b/src/commands/args.ts
@@ -30,3 +30,14 @@ export function parse_arg_kinds(flags: string[]): ArgKind[] {
   }
   return result;
 }
+
+export function bailUnsupported(arg: ArgKind): never {
+  switch (arg.kind) {
+    case "Arg":
+      throw Error(`unsupported argument: ${arg.arg}`);
+    case "ShortFlag":
+      throw Error(`unsupported flag: -${arg.arg}`);
+    case "LongFlag":
+      throw Error(`unsupported flag: --${arg.arg}`);
+  }
+}
diff --git a/src/commands/mkdir.test.ts b/src/commands/mkdir.test.ts
new file mode 100644
index 0000000..b24f4c3
--- /dev/null
+++ b/src/commands/mkdir.test.ts
@@ -0,0 +1,49 @@
+import { assertEquals, assertThrows } from "../deps.test.ts";
+import { parseArgs } from "./mkdir.ts";
+
+Deno.test("test mkdir parse args", () => {
+  assertEquals(
+    parseArgs([
+      "--parents",
+      "a",
+      "b",
+    ]),
+    {
+      parents: true,
+      paths: ["a", "b"],
+    },
+  );
+  assertEquals(
+    parseArgs(["-p", "a", "b"]),
+    {
+      parents: true,
+      paths: ["a", "b"],
+    },
+  );
+  assertThrows(
+    () => parseArgs(["--parents"]),
+    Error,
+    "missing operand",
+  );
+  assertThrows(
+    () =>
+      parseArgs([
+        "--parents",
+        "-p",
+        "-u",
+        "a",
+      ]),
+    Error,
+    "unsupported flag: -u",
+  );
+  assertThrows(
+    () =>
+      parseArgs([
+        "--parents",
+        "--random-flag",
+        "a",
+      ]),
+    Error,
+    "unsupported flag: --random-flag",
+  );
+});
diff --git a/src/commands/mkdir.ts b/src/commands/mkdir.ts
new file mode 100644
index 0000000..be991fb
--- /dev/null
+++ b/src/commands/mkdir.ts
@@ -0,0 +1,64 @@
+import { CommandContext } from "../command_handler.ts";
+import { resolvePath } from "../common.ts";
+import { ExecuteResult, resultFromCode } from "../result.ts";
+import { lstat } from "../common.ts";
+import { bailUnsupported, parse_arg_kinds } from "./args.ts";
+
+export async function mkdirCommand(
+  context: CommandContext,
+): Promise<ExecuteResult> {
+  try {
+    await executeMkdir(context.cwd, context.args);
+    return resultFromCode(0);
+  } catch (err) {
+    context.stderr.writeLine(`mkdir: ${err?.message ?? err}`);
+    return resultFromCode(1);
+  }
+}
+
+interface MkdirFlags {
+  parents: boolean;
+  paths: string[];
+}
+
+async function executeMkdir(cwd: string, args: string[]) {
+  const flags = parseArgs(args);
+  for (const specifiedPath of flags.paths) {
+    const path = resolvePath(cwd, specifiedPath);
+    if (
+      await lstat(path, (info) => info.isFile) ||
+      (!flags.parents &&
+        await lstat(path, (info) => info.isDirectory))
+    ) {
+      throw Error(`cannot create directory '${specifiedPath}': File exists`);
+    }
+    if (flags.parents) {
+      await Deno.mkdir(path, { recursive: true });
+    } else {
+      await Deno.mkdir(path);
+    }
+  }
+}
+
+export function parseArgs(args: string[]) {
+  const result: MkdirFlags = {
+    parents: false,
+    paths: [],
+  };
+
+  for (const arg of parse_arg_kinds(args)) {
+    if (
+      (arg.arg === "parents" && arg.kind === "LongFlag") ||
+      (arg.arg === "p" && arg.kind == "ShortFlag")
+    ) {
+      result.parents = true;
+    } else {
+      if (arg.kind !== "Arg") bailUnsupported(arg);
+      result.paths.push(arg.arg.trim()); // NOTE: rust version doesn't trim
+    }
+  }
+  if (result.paths.length === 0) {
+    throw Error("missing operand");
+  }
+  return result;
+}
diff --git a/src/commands/test.ts b/src/commands/test.ts
index 0c55a5a..0d61287 100644
--- a/src/commands/test.ts
+++ b/src/commands/test.ts
@@ -1,5 +1,5 @@
 import { CommandContext } from "../command_handler.ts";
-import { resolvePath } from "../common.ts";
+import { lstat, resolvePath } from "../common.ts";
 import { fs } from "../deps.ts";
 import { ExecuteResult, resultFromCode } from "../result.ts";
 
@@ -9,11 +9,11 @@ export async function testCommand(context: CommandContext): Promise<ExecuteResul
     let result: Promise<boolean>;
     switch (testFlag) {
       case "-f":
-        result = stat(testPath, (info) => info.isFile);
+        result = lstat(testPath, (info) => info.isFile);
         break;
 
       case "-d":
-        result = stat(testPath, (info) => info.isDirectory);
+        result = lstat(testPath, (info) => info.isDirectory);
         break;
 
       case "-e":
@@ -21,11 +21,11 @@ export async function testCommand(context: CommandContext): Promise<ExecuteResul
         break;
 
       case "-s":
-        result = stat(testPath, (info) => info.size > 0);
+        result = lstat(testPath, (info) => info.size > 0);
         break;
 
       case "-L":
-        result = stat(testPath, (info) => info.isSymlink);
+        result = lstat(testPath, (info) => info.isSymlink);
         break;
 
       default:
@@ -50,16 +50,3 @@ function parseArgs(cwd: string, args: string[]) {
 
   return [args[0], resolvePath(cwd, args[1])];
 }
-
-async function stat(path: string, test: (info: Deno.FileInfo) => boolean) {
-  try {
-    const info = await Deno.lstat(path);
-    return test(info);
-  } catch (err) {
-    if (err instanceof Deno.errors.NotFound) {
-      return false;
-    } else {
-      throw err;
-    }
-  }
-}
diff --git a/src/common.ts b/src/common.ts
index a14be6c..885e194 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -92,3 +92,19 @@ export class TreeBox<T> {
     return new TreeBox(this);
   }
 }
+
+export async function lstat(
+  path: string,
+  test: (info: Deno.FileInfo) => boolean,
+) {
+  try {
+    const info = await Deno.lstat(path);
+    return test(info);
+  } catch (err) {
+    if (err instanceof Deno.errors.NotFound) {
+      return false;
+    } else {
+      throw err;
+    }
+  }
+}